Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c4619fcb1334fa…

MALICIOUS

PDF

103.1 KB Created: 2021-01-10 08:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bd32c64285f413f80390e80450962985 SHA-1: 97e51bc23f5fb707c22133e67e2b0e0619411c5b SHA-256: a2c4619fcb1334fa9ec880325a769e1fd96de2f68e770dcba855e8290b5ced9f
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 0.9997

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://traffking.ru/123?utm_term=college+of+direct+support+ky PDF link annotation
    • https://gugukipibedi.weebly.com/uploads/1/3/1/4/131438190/4933d39082.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/70fda9f5.pdfIn PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/kagivozetis.pdfIn PDF document text
    • https://zenefuzivoxog.weebly.com/uploads/1/3/4/1/134108933/suwukawisore-xowapegasegabez-xabutirupefefa.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/Kidgjhd/ninepupobisuzasag.pdfIn PDF document text
    • https://semoligi.weebly.com/uploads/1/3/0/9/130969118/d2e0a6.pdfIn PDF document text
    • https://site-1178504.mozfiles.com/files/1178504/paper_plane_glider_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/bjfhgfD/97419633806.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/tumagiwidawe-gazogolulol.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jaRhajg/download_game_lara_croft_relic_run_mod_apk.pdfIn PDF document text
    • https://site-1197316.mozfiles.com/files/1197316/easy_thai_learn_to_speak_thai_quickly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_5fd9115bb04ca.pdfIn PDF document text
    • https://login.elsevierperformancemanager.com/systemlogin.aspx?virtualnIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/please_introduce_yourself_sample_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/biafra_national_anthem_audio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A43 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0001543d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543D 5184 bytes
SHA-256: 83c7926f9fef33f0b317d92c286617f026fbd2e954421d262c6622f9f5958b16
font_02_sfnt_off00016606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16606 12172 bytes
SHA-256: c37d20cce97126de2576033b807524cfb51418361a0799069a3e68d0b9b54178

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