Malicious PDF — malware analysis report

Static analysis result for SHA-256 737151f7ce0f8223…

MALICIOUS

PDF

99.2 KB Created: 2021-04-14 23:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cde8f20d8ab67576e1b540f40d630ad5 SHA-1: f9b57a816168bd50d657e83e82cb288e0939db4e SHA-256: 737151f7ce0f8223afdda35d58748f1ded11a3cf0f6ae8670a9847054bf43318
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable domains or known malicious redirectors. The primary purpose appears to be a link farm designed to direct users to potentially malicious websites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=how+to+find+the+mass+of+an+atom+in+physics In PDF document text
    • https://bawowafakapapo.weebly.com/uploads/1/3/4/0/134042412/meborozudutanipeko.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/potofol_pugejanijogobu_bamipu_rifomumawabelu.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/tuwozezepozaz.pdfIn PDF document text
    • https://zowamuzifam.weebly.com/uploads/1/3/1/1/131163536/1a887b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_603e3658d0736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_600139b2859b5.pdfIn PDF document text
    • http://silkhfig.bid/lee_strobel_books_listtdbsa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_6032b562d7835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_60317cce939ef.pdfIn PDF document text
    • http://lalat.space/why_is_religious_tolerance_necessary_in_nepal9ayj5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fofomekurun.rf.gd/telaboz.pdfIn PDF document text
    • http://lojetejimekatow.rf.gd/dinosaur_clothespin_puppet_template.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_c79b4f5ed44e4048b7287047766d72c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a666fd1f-0479-4b80-a77b-849957744cbb/epson_wf_2630_come_cambiare_cartucce.pdfIn PDF document text
    • http://wobemiko.epizy.com/46359304417.pdfIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_53f629dc2ffb4dbbbeba1fd76cfd758e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08a3a19-09d9-4c6d-b6cf-66816dd66d97/white_fang_naruto_fight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3992ee8-5a1b-4025-8c01-5ddfe86f7743/international_womens_brass_conference.pdfIn PDF document text
    • http://lofadekiwi.rf.gd/95420586063.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_40f6038b6e304d7883bd2dadeb53f10a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cfd270-6061-4dec-8335-44efe000061b/detudozeruxojosego.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_473e0109090e41a28cf6b095b06cfd4c.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_1fd80d62954844ebb5cf6cae6145cd3e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 5212 bytes
SHA-256: 822cf6d5963d3fbf6afe19a0656924dc3ba0df530e6bfec4af9d93576c25390e
font_01_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 12708 bytes
SHA-256: 7464735a70c14f9d21daafcdfd6f562bf00adf110edde45b5d355504876d2047
font_02_sfnt_off00015b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8D 16192 bytes
SHA-256: f7c959ef3840947929b2fbf21a6f844c3d2ba9157ff04f9c13ff486e75cc34e4
font_03_sfnt_off000170b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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