Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf04f698fe1a91b…

MALICIOUS

PDF

81.7 KB Created: 2021-03-03 19:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3ac05cf13ab9e1e5c6263fbe21fc19bd SHA-1: 98f3e9a75abb61b6f5375d3107430185393c563e SHA-256: 7bf04f698fe1a91b110753e59a67b8da4db43173f81423850840ab1aa92cf3e3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a lure related to appliance troubleshooting, designed to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=whirlpool+refrigerator+model+wrx735sdbm00+ice+maker+troubleshooting PDF link annotation
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/vawizarima.pdfIn PDF document text
    • http://shoplus.info/bumoxujafarv5no7.pdfIn PDF document text
    • http://discovljzg.fun/acalypha_indica_medicinal_uses383ak.pdfIn PDF document text
    • https://kunuxuzuvedenax.weebly.com/uploads/1/3/6/0/136051690/2545785.pdfIn PDF document text
    • http://foyou.store/fishing_report_salmontygdw.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/b075f038cc9.pdfIn PDF document text
    • http://vovpomnim.ru/free_template_cv_creativehj4ov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_603022f14bd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408587/normal_5ff493fbc8f30.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/tipege.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/iceBicx/no_crop_square_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/iageii6/vozewuluwotunato.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ih3igsb/ar_zombie_shooter_survival.pdfIn PDF document text
    • http://kuzamejeluwezik.22web.org/8948045978.pdfIn PDF document text
    • http://pedrons.space/62079276199whnz2.pdfIn PDF document text
    • http://7gusevshop.space/glioblastoma_multiforme_incidence_worldwidepxltn.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/Tjhhaid/mushroom_wars_2_switch_local_multiplayer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wajoran.rf.gd/35534913526.pdfIn PDF document text
    • http://benuniwutaferaz.epizy.com/86359526910.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_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 6456 bytes
SHA-256: b2572ae56cd935a43b0fc1760c21d404701c3b154c7f3eaea5b2d0a9c4035bfd
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 11452 bytes
SHA-256: 109261a8ec370b02fa2db57e00b51b5537077a226a6e4f714d6b268ba58e24e5

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