Malicious PDF — malware analysis report

Static analysis result for SHA-256 3772ab07e51c1f4c…

MALICIOUS

PDF

75.2 KB Created: 2021-04-07 14:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 825c454bda9bc040eeac3c537c0415d5 SHA-1: d59e9032a08d8ee17f7de4ccb9c7911f98a5574b SHA-256: 3772ab07e51c1f4ce5c91c0322384abe0666e55d49d367a2197669065fac2a53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites, potentially for downloading further payloads.

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 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://zajinet.ru/123?utm_term=asus+x200ma+notebook+drivers PDF link annotation
    • http://znohist.site/pearl_hot_tub_troubleshooting_jetst1jug.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jz6PYWd/ice_cream_maker_joseph_edy.pdfIn PDF document text
    • http://natur-bio.space/banularokekerazojifanuliasdzy.pdfIn PDF document text
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/vogogebixi_tebedozinoz.pdfIn PDF document text
    • https://sazizilas.weebly.com/uploads/1/3/0/8/130874530/falowiba-mitobonixuj-gimilifir-kawugowik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_605009bc3150f.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/8583889.pdfIn PDF document text
    • http://fc-aromat.ru/how_to_replace_air_purifier_filteromnam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_600c3532efd67.pdfIn PDF document text
    • http://dinudavap.iblogger.org/29353103089.pdfIn PDF document text
    • http://stavki.link/the_revenant_2015_full_movie_youtubeg40uq.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/SCZXoEA/drift_race_car_driving_simulator_mod_apk.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/4488259.pdfIn PDF document text
    • http://newonesitel.22web.org/non_chronological_report_examples_ks1.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuvobu/vjcjbih/download_meetme_app_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5fdf96e872979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_6000bbecaf7c2.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/kugirazelufal_zenanumaw_tilil.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/YyiaWKo/space_images_clip_art_black_and_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_601a51f3d74b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxiriselof.epizy.com/champion_inverter_generator_3500_dual_fuel.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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 5532 bytes
SHA-256: 9aba3f11250ebb3bbb3b24e20bc711b6b5d8b63985241ad93414f5b312faba7b
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 11124 bytes
SHA-256: 49e43d52261f6575e1369c729f50d84e4344414b440201eac6b4f37444273761

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