Malicious PDF — malware analysis report

Static analysis result for SHA-256 a235771f98263f7f…

MALICIOUS

PDF

85.1 KB Created: 2021-02-13 21:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 45dd848d79fb0c80979229fa08e73519 SHA-1: 8a224dcd71a8171d084adab9fbec59497b763974 SHA-256: a235771f98263f7f8f8571ff32c8fbf678e4e8e69586a8785f1ef74ffc3490e4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification point towards a malicious document, likely intended to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=electrochemical+cells+pre+lab+answers PDF link annotation
    • https://cdn.sqhk.co/wuzexesetaba/gdgjljf/soul._io_crazy_games.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/hghhYhd/84277785940.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/rumogetex_nivoja_bavepolivixope.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/4510715.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/070c246.pdfIn PDF document text
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/1196170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5fdd31b02ed41.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/lawol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5fc62bdbc0eca.pdfIn PDF document text
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/d628a6abe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6023f9887cfc5.pdfIn PDF document text
    • https://lugoponogib.weebly.com/uploads/1/3/4/4/134404253/f6330.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
    • https://s3.amazonaws.com/fipijife/microsoft_text_to_speech_voices_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/ugc_hrdc_bharathidasan_university_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/vibaxonaxux.pdfIn 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5152 bytes
SHA-256: 764b581d7274f69047dba5d36542825172833cd4a448efd02138065b087e387d
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 14856 bytes
SHA-256: d258e16bc3a1785c944c35c011a66ca4e5a1b9bed06539936d7cadbfa0e3564b
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16104 bytes
SHA-256: 1bcf53f118a13cb2c15bf81ae561e2e07ac2f2e26000da769cdc076b522e496e
font_03_sfnt_off00013856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13856 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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