Malicious PDF — malware analysis report

Static analysis result for SHA-256 3738effe61b4b602…

MALICIOUS

PDF

76.7 KB Created: 2021-03-17 03:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e69eff398e2a318e4d146bb194455d63 SHA-1: 845191cd91a7c7fc823bbf3a826d4618b03bd6b2 SHA-256: 3738effe61b4b6027da2f48ec8850c77ee3b3af9e8858a123bea41edbd1e106e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or SEO spam campaign. It contains a large number of external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+draw+an+isosceles+triangle+in+a+circle PDF link annotation
    • https://cdn.sqhk.co/rufebumu/cxsjiji/26123198602.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/hjjjeeL/pazasiboxepevel.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/hzgcgfD/53405271533.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/65769000525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/facebook_pixel_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/lubobavurebonuketi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3b593b-6374-46e2-b17f-13255b514734/sparknotes_midsummer_nights_dream_act_3_scene_2.pdfIn PDF document text
    • http://wimarewixogax.epizy.com/burma_tv_9._4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e1df2c-c8a5-4784-be2b-684674789d76/zotisupoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8d8fac-7b0d-4c0c-942c-d09025a912ed/linksys_ea4500_max_download_speed.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_0f92828e426945b8bb2d6467c555e3b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7214d289-1403-4d82-adbb-2a5c934240a2/kujodamivulujozuvisilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba69ab19-31ae-47dd-8e18-fbe79ca11628/king_lear_sparknotes_act_4.pdfIn PDF document text
    • http://retejepak.epizy.com/how_many_acres_is_disney_california_adventure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195250a2-b8b3-48d0-a0f8-4623de971e1b/towuvamaxedopedowarom.pdfIn PDF document text
    • http://junulanomelab.rf.gd/foluzijipal.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3de7d7d013e24bd19d43d2d4ac5900dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/chillara_kottu_chittemma_songs_movie.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_b48afab1906b42d99b19acc70bd98592.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79f2519-a1c6-47be-8708-aaa593bf1c2a/how_to_turn_off_sophos_endpoint_security_and_control.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/latin_american_independence_worksheet.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_b133d5ced4aa4a278d5b050076705005.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 5160 bytes
SHA-256: bf70c4fc8c9c1d753fc7b2124a97921faa60caa76781cc62eb4d3c8c68aeb4a6
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 10952 bytes
SHA-256: c8317c4d2c68a37e3ab682783da5cb916c8b4bd76acb5bce367a8932d0050d0d
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6

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