Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dc4c3454edfe0c…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 16:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1416780a79ea8432f0d5c964395ca3d8 SHA-1: 1290e4a4d82eb80342c292ed60a13db4d4bb37af SHA-256: 33dc4c3454edfe0c15897f1bc69b941f7cfec31c8753790e0ba04e633389d1ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=convert+html+to+pdf+react+native
    • https://cdn-cms.f-static.net/uploads/4491688/normal_6058d6d3c5a68.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd685f347465.pdf
    • http://fegiroxopirez.sportsontheweb.net/xudofusivarinuxodizubug.pdf
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5ffd739a3e49a.pdf
    • https://cdn-cms.f-static.net/uploads/4447089/normal_6056d18754cf1.pdf
    • https://cdn-cms.f-static.net/uploads/4413122/normal_605caf76dcd37.pdf
    • http://lubenoredeji.mypressonline.com/22301745395.pdf
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6054edeab5c69.pdf
    • http://ruvujagefeko.mygamesonline.org/geremetidupu.pdf
    • http://legibovusapezo.mypressonline.com/dibiriwiderudibemidonipon.pdf
    • https://cdn-cms.f-static.net/uploads/4392862/normal_60379c271d5b3.pdf
    • http://pivojowemetobiv.mywebcommunity.org/lagalew.pdf
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5fe4ac8611351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sodowurivav.onlinewebshop.net/google_driving_directions_to_multiple_locations.pdf
    • https://uploads.strikinglycdn.com/files/509d27c4-9610-47db-bc08-10d162fa4f97/98556101332.pdf
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_b47b2934c13b42e39998ff53d43ada75.pdf?index=true
    • http://dogiwexor.myartsonline.com/18041721610.pdf
    • https://uploads.strikinglycdn.com/files/8beec39a-884e-44f3-bae5-49374a9f42b5/neuro_linguistisches_programmieren_fr_dummies.pdf
    • http://xolevusafo.myartsonline.com/how_to_adjust_toro_300_sprinkler_heads.pdf
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_401b448340a24bdaae399a33838631f3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e003.bin
9f55196f9decea9c668f41b9e16cbfe2a6484eb16c2abab2d5b0730192c3bb4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 5180 bytes
font_01_sfnt_off0000f17f.bin
7f5ecbdd25015cb2d62bfc35ef28f3d18db98cd29a928c0dc4317f07314ef1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 11740 bytes

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