Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5268d86de434b48…

MALICIOUS

PDF

75.7 KB Created: 2021-04-25 18:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 61d8fc48459217e0b38ea47775c3ce72 SHA-1: c4ecf3d0a70efa94b2b5585aaa0965dbee4be022 SHA-256: e5268d86de434b48ce81c395b39eb0cf57c2ddb99327529c6cf0e160bfac0b21
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://pelibifir.ru/strik, appears to be part of a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. No scripts were extracted, but the document's structure and URL patterns suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=lyrics+stressed+out+lyrics+twenty+one+pilots+meaning PDF link annotation
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/75931.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/saxon_algebra_1_cheat_sheetusnz9.pdfIn PDF document text
    • https://gonamaputopo.weebly.com/uploads/1/3/4/5/134511465/6802445.pdfIn PDF document text
    • https://vutibije.weebly.com/uploads/1/3/4/6/134672754/96f43b85106dd.pdfIn PDF document text
    • https://pobasejedewepiz.weebly.com/uploads/1/3/4/0/134017346/8870869.pdfIn PDF document text
    • http://hangzhoumetal.ru/vizio_sound_bar_remote_control_appm6oip.pdfIn PDF document text
    • http://lianhua.life/facebook_ads_tutorialsdx2a.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/7681cde.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/fubujuj-fudonanaxuseb-fevimajojog.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/6161223.pdfIn PDF document text
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/pobovu-demobopa-vujapepijewi.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/guwofofubu.pdfIn PDF document text
    • http://alexandreablog.com/the_entertainer_piano_sheet_beginnerbqz50.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/sirilagewuga/juwuzudib.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/29322140398.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/66717741590.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_b8f09fdf02724624a724c711b72c9c7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/76780249245.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/59680198582.pdfIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_3e7a0629c5c043f996a706c7e4bf2ba2.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_901f8f95595b432599abee410baf0961.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5528 bytes
SHA-256: afd2c6e76bc3a8e9e9696fb8b341977143d4cc4ea9ce32eee12ebe776d5050e4
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10808 bytes
SHA-256: bd49abb8af373cff4b21dda58c50f7fe61c92b116a3a3fe9cfad8f5425f764d2

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