Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecf945eb44fbba1…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 16:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8ac76f4f7932522a652c544d9be5468e SHA-1: dfafa6365226e4b6c933fc9f28b7e4c4c66767a2 SHA-256: 5ecf945eb44fbba181d551504d63067557b8e8ddf32768e22cb1c763750105b1
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious phishing document and hosts a link farm of external PDFs. It embeds a URL leading to 'mezovuduw.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to contain a question about food content, suggesting a lure to engage the user. The presence of numerous external links, including one to a suspicious domain, strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+many+carbs+are+in+bojangles+biscuits PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fefc730130e9.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/9089660.pdfIn PDF document text
    • https://baduzizexajozej.weebly.com/uploads/1/3/4/6/134653824/78c6ff870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_606781433638a.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/6415847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_5ff8200aaf82e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5ffe51ec4c62f.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/wamatasamegu/return_address_format_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/dezukegobalobijis.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/52978115232.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/hisense_40_inch_smart_tv_h5_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7a5f4f-e333-41b9-b2f0-0cffb01461c2/99684313428.pdfIn PDF document text
    • http://vujogosofeti.epizy.com/business_plan_for_fast_food_restaurant.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/gw2_ascended_berserker_armor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/32703954943.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/42337753316.pdfIn PDF document text
    • http://tewalilakoj.rf.gd/predator_2000_generator_leaking_oil.pdfIn PDF document text
    • http://resawopo.epizy.com/careers_in_graphic_design_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f9b392-07e3-4ffd-adee-51e7b28b5731/78857738656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134ae3b5-3629-43e4-b5b3-0c7b9797b19f/24754676162.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5488 bytes
SHA-256: 87b72a756fc4d26a917667a4cdf75539b85a331208a8e05f3fbce3e8cc28a21c
font_01_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 11596 bytes
SHA-256: 34d3acaa7f0d59420a5803de9efc9f7f831bfbe68f167886c89fe3413663e508

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