Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc3c16908065376…

MALICIOUS

PDF

160.3 KB Created: 2021-06-10 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 44c2409b85c17be267aaa57b101c0a1d SHA-1: 5eb3eaea2532ae7b180628336605cec65e30c167 SHA-256: 8fc3c16908065376376be1b63b80d6e743feb1b48ff5a3b2ee1f7af1b58858fd
194 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 and an urgency-based lure. 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 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/56a03f6.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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/pbw?utm_term=shooters+io+space+arena PDF link annotation
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/56a03f6.pdfIn PDF document text
    • https://rifopiponekusu.weebly.com/uploads/1/3/5/3/135346758/be59960d9f995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_6015305fcc9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6052e42c200cd.pdfIn PDF document text
    • https://lemosipezo.weebly.com/uploads/1/3/5/3/135326275/ganuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603974dad0af3.pdfIn PDF document text
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/xupig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_60431885a390d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5ff024fce9250.pdfIn PDF document text
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/bd400ab8d8212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_60633fb75e92c.pdfIn PDF document text
    • https://nalujedadi.weebly.com/uploads/1/3/4/5/134514722/malavig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_602745ff1106d.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/javiluwesiwilare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_603bf2c394e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_6049b55a20422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_603fda78c50ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://domewisisu.pbworks.com/f/vozuzudogisubovikurinego.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144823932/fezilovudiwifuzakemeleni.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144524172/a_plastic_ocean_video_worksheet_answer_key.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144466839/80445888329.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/f/23746033591.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144634209/kumelidudimodi.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/1999_jeep_cherokee_repair_manual.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/zitarimarozazuzo.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/w/file/fetch/144587169/remini_photo_enhancer_pro_mod_apk_download.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/themes_of_oedipus_rex_ppt.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_off00023a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A6A 5092 bytes
SHA-256: 0cadce42663a219dbc620f4db96dd3b746640a0e12f21e052dfe6377cf565a75
font_01_sfnt_off00024bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BAC 11224 bytes
SHA-256: af4214e921c58f0788df8ad568db00cad579164af9529909d3e662d27821c5e9