Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dc91efec6e2343…

MALICIOUS

PDF

70.4 KB Created: 2021-05-18 22:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ea5f0f25708fcd6add056d8230b391a1 SHA-1: 5495323aa98b8cee11eeec3d2636be1ab525e27b SHA-256: c0dc91efec6e2343f8bcb596533367420236421d4c6a24aa87d67a385b3c35d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 6

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=bir+mandaluyong+telephone+no PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60175ddd2dc36.pdfIn PDF document text
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/c5677a56dc90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fefcf8572991.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/wopapezu-pabanizo-rejekidajisilal-vugalasovarev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fdb669d4ca8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_604bc997561b4.pdfIn PDF document text
    • http://lajenasuwo.iblogger.org/bhajan_dj_song_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_605fb26317464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fe5b53ec5ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6039b0ef57520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_60082b85e2bec.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/tezofuretejom/zewixu.pdfIn PDF document text
    • http://talulof.epizy.com/luzonavadipifijiluvoxu.pdfIn PDF document text
    • http://tutalisog.rf.gd/rojijufekosojimenolu.pdfIn PDF document text
    • http://genolesatoj.epizy.com/javascript_tutorial_point_full_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/bsa_digital_merit_badge_pamphlets.pdfIn PDF document text
    • http://ximitexus.epizy.com/tc_helicon_play_acoustic_software.pdfIn PDF document text
    • http://poposepoj.rf.gd/alyson_stoner_2019_vmas_full_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/cheerful_sentence_form.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 5344 bytes
SHA-256: 440952ac68d1101d39ede812e931f9163d6572a40a939981d7e388f28a12cc0b
font_01_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10704 bytes
SHA-256: b96b33da2d08102189b1941e12f2af5b008079d787ba86319a7e62107b2b3e29

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