Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc1b69dc038e51e…

MALICIOUS

PDF

78.5 KB Created: 2021-05-15 06:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5400112d6583f04c4fbd0fa79d571a81 SHA-1: 1e3b0a91c856a61212a45113e7df5b85d35af862 SHA-256: 1cc1b69dc038e51ec04e2dd248eec5ab1bff2f74bf2c414f2f0a409591deaf1f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links to various domains, many of which appear to be disposable or dynamically generated. Heuristics indicate this is a link farm designed to direct users to potentially malicious content or for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://scrlt.xyz/777519884ds2rb.pdf In PDF document text
    • http://helplnstagramcontact6088756.com/whale_follows_mouse_game_scratchcaa4f.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/cuanto_tiene_que_sobrar_en_una_zapatillaokbl2.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/8130819.pdfIn PDF document text
    • http://floradoma.net/tableau_voyageur_contemplant_une_mer_de_nuagesimmju.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/remoza.pdfIn PDF document text
    • http://webmastervlad.ru/vax_platinum_carpet_cleaner_black_fridaynxle4.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/togafiga.pdfIn PDF document text
    • http://fruct.space/danapitojabstazu.pdfIn PDF document text
    • http://rameautbxy.space/powusidafepadutawagizaju0lg4q.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/3676297.pdfIn PDF document text
    • http://gufutaca5.xyz/6678647901173j2y.pdfIn PDF document text
    • http://mangalvpodarok.ru/sudivvuqz4.pdfIn PDF document text
    • http://atomyimperial.ru/22625639203lbb8o.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/8812da8d2.pdfIn PDF document text
    • http://antileqphh.site/corporate_manslaughter_sentencing_guidelines_2016g17oh.pdfIn PDF document text
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/silunedimidiva_viletema_toviguzo.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/fobomujize.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/9_snf_almanca_kitab_cevap_anahtarxld0v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=calvin%20and%20hobbes%20quotes%20best%20friendPDF link annotation
    • http://goromanoza.rf.gd/kemevoxejezizagiko.pdfIn PDF document text
    • http://ribofajelimo.epizy.com/betagibujo.pdfIn PDF document text
    • http://nesowoxaxisaxa.rf.gd/benign_prostatic_hyperplasia_bph.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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 5224 bytes
SHA-256: fcf570ea59b5b32c54270bff6e152f578619f7f8a2e006bb43668930969e58c7
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 11468 bytes
SHA-256: ce03f8af5c00b0833a614d1ac2197b085264c29ef37ec843968a63a37f7edcab

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