Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e722a5249045510…

MALICIOUS

PDF

82.6 KB Created: 2021-03-20 17:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2a3fdd9b74e557a997be37b6921e1580 SHA-1: 0470ae50ff5461495ba3e891b3cbc8ee8e0f5ddb SHA-256: 3e722a5249045510ef9c75a3d140793a6cf4562f4e153292c3fc45a4397ab2a5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to drive traffic. The primary URL, 'https://druttle.ru/wix?keyword=sniper+3d+hack+unlimited+coins+and+diamonds', indicates a lure related to game cheats. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=sniper+3d+hack+unlimited+coins+and+diamonds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449984/normal_5fda14e3f1058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5fcc7b94a1a0f.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/autocad_3d_modeling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_602530fa2f108.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/64899998834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_60551cc15a96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_60483020dd564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_601a531463c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_603b538738cd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4f961c-f787-40d8-aea5-cdd4be093abb/jikewilizejogewav.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_6d3782af11bb437da96f0676013680ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/3d_games_for_android_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/majesty_violin_sheet_music.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_7984ea899fb44b51b7421bb2ca205153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dd1070-6101-43f6-a0a6-5785934a52be/482050661.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/absolute_zero_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a7b568-ab80-4b98-bd2a-a45636931bd7/33957190421.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/formal_languages_and_automata_theory_course_file.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 5644 bytes
SHA-256: 0dd2b7538a782aae6797e5dc05561020c83bdf1c099c8f20149474821346bbac
font_01_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 10940 bytes
SHA-256: e5075ab2cbcb22e8fee77398b7ef3a8c9e44392e6967c8815fae9d63c36b38cf

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