Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c768343c1f99027…

MALICIOUS

PDF

79.5 KB Created: 2021-02-06 02:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a49d65cbb18a9ca799c7b49dfcb93e25 SHA-1: 0e53912b440e64e0e6ba4a278bfcebb4c4313f96 SHA-256: 4c768343c1f99027dc558a039a1c7735087534e3bc748824ba85c73bab977cc0
186 Risk Score

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://bologen.ru/123?utm_term=monument+14+savage+drift+pdf PDF link annotation
    • http://calipshatngaccs1.xyz/the_aether_life_as_a_god_mod_unlockedverl3.pdfIn PDF document text
    • http://helper-badges.com/etapa_precientifica_del_trabajo_social_boris_limai0a6a.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/FfAicjg/youtube_dinoland_animal_kingdom.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/rasiju-zomelek-nujinuvakudefaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/37hiqHL/81208937004.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/depame_sofigejejiti_durefalusujazo.pdfIn PDF document text
    • http://moneyindia.site/23419828248knnur.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/2534157.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/wheUUKk/vorixelipoz.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/rusaj.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/ozjg5jf/26292874718.pdfIn PDF document text
    • http://milanomoda-italy.website/hydro_dipping_with_spray_paint_instructionsgf3t6.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/xQegezY/tamewikeguxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 5532 bytes
SHA-256: 02bf43bed1208534a7d042568f68924d48b9676e5e5dbd79060ff79c9dbde626
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 11208 bytes
SHA-256: 6f37a1e67587bc3a6389169bd11f2061bf12dcb98f2573f872aadec37854f0fd