Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb0c5f923ce5b5a…

MALICIOUS

PDF

77.3 KB Created: 2021-04-17 09:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ac8a09e4c997c8a7cb7bb05ad2dd9051 SHA-1: b378578efbc82d68833e28e277b893489a332153 SHA-256: efb0c5f923ce5b5ae63a1ecfaf4d2d114bfca2da3f548371a18793ca65c72bcd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9993

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 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://soxebez.ru/strik?utm_term=what+color+absorbs+yellow+light+from+a+laser PDF link annotation
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/mifonufebowilanuwof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_606d946104471.pdfIn PDF document text
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/kixefol_nevifopuzi_dumifu.pdfIn PDF document text
    • http://vowuzif.22web.org/tujeteramuresipa.pdfIn PDF document text
    • http://gediputelilana.22web.org/kewefebajixeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60641ba89236a.pdfIn PDF document text
    • https://lemagijazifar.weebly.com/uploads/1/3/2/7/132710763/polobulidanaz-zebugipibu-jawoninev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_60387e0f524f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_6022b025122e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_605b4f8039a35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonesipida.epizy.com/audition_playpark_manual_patch.pdfIn PDF document text
    • http://simabox.epizy.com/a_murder_is_announced_penguin_readers.pdfIn PDF document text
    • http://mepatizus.epizy.com/27966366554.pdfIn PDF document text
    • http://redubemupaluk.rf.gd/99126665863.pdfIn PDF document text
    • http://pinakebe.rf.gd/fibidegabobajomolevibotof.pdfIn PDF document text
    • http://wewuvarek.epizy.com/28916180915.pdfIn PDF document text
    • http://vimobuzu.epizy.com/politique_environnementale_dfinition.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/direct_thrombin_inhibitors.pdfIn PDF document text
    • http://nikibulafejew.rf.gd/celotex_ga4000_insulation_board_data_sheet.pdfIn PDF document text
    • http://fikelamizogu.myartsonline.com/55549576267.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/pemumemetaxeromapopilu.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/cartoon_hd_app_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/25495565516.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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5644 bytes
SHA-256: 4e77f41b625ddf9bb6f47d5b3431998dbad3c435813acb5269e7fa227b86dfb3
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 11132 bytes
SHA-256: 7e06523ac88ff3d0a8d7a6852cc260b1e26875143fa0e68d894ecde6de3f8994

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