Malicious PDF — malware analysis report

Static analysis result for SHA-256 840a4b6aa76d6678…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 11:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcd0ceb96ee9fabf15ab75c46e960a84 SHA-1: 1e3986fcbd07816fc301ef04e6e29abab022abed SHA-256: 840a4b6aa76d6678a8e7b276bdea3140110768031f4410a28ea22d9d84267ca6
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://golowaki.ru/wix?keyword=redmp3+not+working PDF link annotation
    • https://cdn.sqhk.co/dimumaneda/gchciay/binojezovomiji.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/Ufvzjbp/furniture_mod_for_minecraft_pe_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/u4dbibY/74878055301.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/rnhdOIB/30471705863.pdfIn PDF document text
    • https://tupefumezamubew.weebly.com/uploads/1/3/0/8/130874634/421b50994f5aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ighdVhe/kupinoweb.pdfIn PDF document text
    • http://zejadovota.iblogger.org/isotopes_ks4_worksheet.pdfIn PDF document text
    • https://fejigurize.weebly.com/uploads/1/3/4/5/134509658/830ead892f1543.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/rarilikasoj.pdfIn PDF document text
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/6687092.pdfIn PDF document text
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/3824656.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/9iciijg/39175375390.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/fenatagazise/bts_idol_full_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/josolage.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/tojubulekodapapotonim.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/xanagetenixuru.pdfIn PDF document text
    • http://lilufafuf.epizy.com/the_right_swipe_alisha_rai_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/zutojezosiwusezal.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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5188 bytes
SHA-256: 8208256849e484c95727c67c4ad9844249e5b1a3ca29734c3537a569acf68461
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 11108 bytes
SHA-256: dae6b7da7572bc80510205741fad0ba7d7f7cf970e340f38e25972981fe5a427

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