Malicious PDF — malware analysis report

Static analysis result for SHA-256 9855cd8c9d9e730b…

MALICIOUS

PDF

73.7 KB Created: 2021-03-03 10:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 75b73643452d986dd93b354fdf9cfada SHA-1: 99ce0b2ff860aa004d8c5ae1b86a7d10f9bb778e SHA-256: 9855cd8c9d9e730b5cbfb0ae9b7245e7fae80ba5722f6146efb2add2b8cf182b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/award?keyword=simplicity+wonder+vacuum+owners+manual PDF link annotation
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/894636c12f9716e.pdfIn PDF document text
    • http://pogadai.xyz/zeniwizi88zl2.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/d6iUjgL/ice_cream_cup_cake_maker_doll_making_games.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/lasulavejivarep.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/eiDKQiM/offroad_4x4_car_driving_mod_apk_revdl.pdfIn PDF document text
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/ffde68f.pdfIn PDF document text
    • http://particulieres-societegenerale.best/nanukekebazuparokovufokt8y46.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/WYhcjb5/charm_city_kings_official_trailer.pdfIn PDF document text
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/jomufigawag_julaz_satise_lasewewafekila.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/ab049.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/kadorufiwoluwo.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/guvodezela.pdfIn PDF document text
    • http://grantmedica.ru/etc_hec_law_gat_answer_key_2019veg9b.pdfIn PDF document text
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/078a8788903b20.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/rugekinuziwopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwejepemesifo.epizy.com/how_to_study_for_the_verbal_reasoning_gre.pdfIn PDF document text
    • http://mafelag.rf.gd/31378934372.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5576 bytes
SHA-256: 575270a74c8267e65750c3984f6cbaf11030fc814dc0b425a1425636d214abe6
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10924 bytes
SHA-256: 90d68e7f77e4e9be477bc49bf34f5556759f92ca444a4aaae4fa8510f270f9ee

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