Malicious PDF — malware analysis report

Static analysis result for SHA-256 9405d7c4f6234ab6…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 19:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d5465ea87cfe3789ab267fda3aca65fc SHA-1: e43914ec999c1ac63b3798d9a1d2dca60512d5d8 SHA-256: 9405d7c4f6234ab6a828131d01fffc9186714975c5ad96bae1a58fcab15894ce
156 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 0.9997

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 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.
  • 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://kuzutuzo.ru/award?keyword=reading+worksheets+with+answers+pdf PDF link annotation
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/ripopiwo.pdfIn PDF document text
    • http://gesabagipo.22web.org/17747740201.pdfIn PDF document text
    • http://konolux.medianewsonline.com/rujik.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/71622248038.pdfIn PDF document text
    • http://vibijinit.scienceontheweb.net/kogiloriru.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/motajamu_fupoxuxo.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/boldogsg_mint_versenyelny.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/gomaxod/33443381406.pdfIn PDF document text
    • http://luzafofefo.rf.gd/9741592822.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/devudutenavinulotoben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1accb1b1-fc1b-4866-b2cf-52d20e011903/life_fitness_95xi_elliptical_cross_trainer_manual.pdfIn PDF document text
    • http://kakavogulogij.onlinewebshop.net/70071644883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbba65f5-9c0a-4197-a872-68545da815b7/stopping_by_woods_on_a_snowy_evening_appreciation.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/64609310180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eac5fb3-b59b-4890-99bf-9e280d338e17/89931719325.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/samsung_galaxy_note_4_unlocked_new.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dc5178-3211-42dc-befe-63f3e4114232/57673901055.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/blackberry_phones_android.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/pediatric_sepsis_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/81630176716.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/5922908565.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_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 5436 bytes
SHA-256: a5f95c70e3e84b6c31ea69ecaf4d56eb7574d25035059c69198a29090daff2ef
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10764 bytes
SHA-256: 2d2ce2033f463a5609237e9daeb07477d8c3aaa2a2821f746df9d1a1621552c1

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