Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1a3ae1ea19f2cc…

MALICIOUS

PDF

82.7 KB Created: 2021-02-07 21:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 06bb104d6df525cfef973b6bd466ea40 SHA-1: 830142614c53e3b8e6d6ce6add84601f711da64d SHA-256: 9c1a3ae1ea19f2cc4f22fd40adc43e8090008e053eff73b274387c070026da02
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a brand-impersonation credential phishing lure related to UPS. It contains numerous external links, including one pointing to a redirector that ultimately leads to a PDF file, likely serving as a phishing page. The presence of a link farm suggests an attempt to generate traffic or obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/2998605.pdf.
  • 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://maypoin.ru/wb?keyword=windows%207%20ultimate%20antivirus%20software%20pc PDF link annotation
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/2998605.pdfIn PDF document text
    • https://bituzuvuzi.weebly.com/uploads/1/3/5/3/135389462/d4addf7fa0772.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/xegukog_vijilufavo_nurakofebudos.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/c2f7b91409cb376.pdfIn PDF document text
    • http://xexejidabame.22web.org/anne_marie_friends_320kbps.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/wibonosar_luzara.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/gekobuje_mitubuxuzas_zudedasuwo.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/c08228.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/gerowaporafatef.pdfIn PDF document text
    • http://infokurs.design/91636643787loeba.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/loneminovu/valamovazasozamenujow.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/business_report_conclusion_and_recommendation.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/w-_4_allowances_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/1819991006.pdfIn PDF document text
    • http://navibizo.rf.gd/attendance_allowance_forms.pdfIn PDF document text
    • http://fipegaz.epizy.com/specialized_roubaix_bottom_bracket_cable_guide.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_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 5548 bytes
SHA-256: e424d04dfaea7e2f41bbf1b1656c243a6d417d2bf5f7d547b78cece163c0674f
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10896 bytes
SHA-256: 6356c9037984da2013de6699abeffb0378170c1976c6a9b66bcd9af9074abaa5

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