Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c73ae4cc1261dd…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 04:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85fd823b3a983dd2bfbae4893b3ebbc1 SHA-1: 9d087e7b34ae5b1278a6707a171e1cad74b3d2cf SHA-256: 55c73ae4cc1261dd1ff9877c212737952d432d9af1d10730ad739d7c2e7aaf0c
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://crophysi.ru/wix?keyword=pros+and+cons+of+artificial+selection+in+dogs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcaa0a866483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60256661a9010.pdfIn PDF document text
    • http://znohist.site/bopelupaxerafuwakanirinaa81j.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/cUEjiCz/wolf_horror_sound_ringtone_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_6010ccc76c54b.pdfIn PDF document text
    • http://agent-ritual495.online/80074975628r51zh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2f0e4ef95.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/english_short_stories_for_grade_39n634.pdfIn PDF document text
    • http://2gusevshop.space/94607544222ksvw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384318/normal_5fcc8ad7db814.pdfIn PDF document text
    • http://onlyforyou.space/sasirararatix3sbie.pdfIn PDF document text
    • http://santand-es.com/82734566858xqj0o.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/hjTgikD/13982550901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5fdf864b016a3.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/BKDHdhb/drill_master_4._8_cordless_screwdriver_charger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_600fffc3247ab.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/4k8KCYX/top_10_lists_david_letterman.pdfIn PDF document text
    • http://amaryllis.space/babuvabonekozafuttq53.pdfIn PDF document text
    • http://uscreditmonitoring.info/gowubojijofisoxuxetobp1sn1.pdfIn PDF document text
    • http://amorexpo.com/gewotuwaj758fw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_9df5d724d9824031b90cb2d6d9a758e1.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_7534b73071d04cf3b20a1f11767754db.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_0598ac50b5184e879959c07e1d4b7cb6.pdf?index=trueIn 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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 5192 bytes
SHA-256: 5e1f539c32bb94f26df28b316841ed3b22e21ea25112db2bf5bdfd11c7820cb4
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 10632 bytes
SHA-256: 438788362f1d80335a9ed601af396fdccdf0474d1f36e0a5c642a418b65a003d

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