Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a95bd85c914a8fa…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 02:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 469a99bb3a278de21f9afe66f0cba9a8 SHA-1: 5b7589360e03b53d38119bc1d6655eaf69ab56e9 SHA-256: 1a95bd85c914a8fafa7258b2faf7b066e8a73087aeaafb488d92f46ffebd422d
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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://nisudine.weebly.com/uploads/1/3/1/4/131454656/fawemonujemegu.pdf.
  • 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://seumenha.ru/123?utm_term=cbcinnovis+inquiry+on+my+credit+report PDF link annotation
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/fawemonujemegu.pdfIn PDF document text
    • https://deluneruniji.weebly.com/uploads/1/3/4/0/134012649/pepije-josobed.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/reponegib-gevoke.pdfIn PDF document text
    • https://xisofigutuf.weebly.com/uploads/1/3/0/7/130740477/1388616.pdfIn PDF document text
    • http://crispyset.online/54565166303h0pdv.pdfIn PDF document text
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/zimuvuvojenubim.pdfIn PDF document text
    • http://jobware.pro/icu_book_marino_5th_editionkwh58.pdfIn PDF document text
    • http://latencfsrt.space/dilapovajadabukxu58.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/dowozewokev.pdfIn PDF document text
    • http://reduslim-shopofficial.site/xbox_360_controller_vibration_not_working_pc1tzyo.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/gx3ggji/981067119.pdfIn PDF document text
    • http://marketeuro.pro/526841154971b64o.pdfIn PDF document text
    • http://pe50off.info/33603212034frir8.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/jdhe3hj/pottery_barn_teen_loft_bed.pdfIn PDF document text
    • http://smartcoin.design/55404683616vbdpc.pdfIn PDF document text
    • https://wowimenus.weebly.com/uploads/1/3/4/7/134709331/6bfcc36ba.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/wulagisi/why_is_my_xp_pen_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/eccentricities_of_a_nightingale_script.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/a._c._market_all.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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5308 bytes
SHA-256: cc27813692d72dfc01bb9602a862713d40c390e45eaada9fad130d5fdf276e95
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 11096 bytes
SHA-256: 121aa453b982ae001c900d0bfcb6edbf36dcc87846967818deb23dfb758f4c5a

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