Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bc8538f48a62a7…

MALICIOUS

PDF

71.5 KB Created: 2021-02-27 03:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d2c0523e141d46e17133b6dea1d5544 SHA-1: 108ce485f695b09d1d1a2cae25c2f593a6b8c57a SHA-256: a0bc8538f48a62a78daa58418acda2eaed94b04b55d9ab42ee17930a4fed14f7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=how+to+do+my+own+small+business+taxes
    • https://nakafafokebupop.weebly.com/uploads/1/3/1/4/131437029/kolovotejum.pdf
    • https://cdn.sqhk.co/jirudumom/gehij5O/turofer.pdf
    • http://xejopegig.mypressonline.com/what_is_the_meaning_of_the_word_hieroglyphics.pdf
    • http://fefiwizam.sportsontheweb.net/96855206319.pdf
    • https://cdn.sqhk.co/wanadujogo/TaShbw7/67272143967.pdf
    • https://sibanozaniso.weebly.com/uploads/1/3/4/8/134858677/vulitufefepagasin.pdf
    • http://warixedivukinat.mygamesonline.org/33577064076.pdf
    • https://cdn.sqhk.co/kelulegawi/rfiajfs/turbo_card_atm.pdf
    • https://cdn.sqhk.co/ruwonumatag/cic2zvK/88581825419.pdf
    • https://cdn.sqhk.co/vibisimak/mjggmjs/ice_scream_2_horror_neighborhood.pdf
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/vagivobezadi_pomejamozinabub.pdf
    • https://cdn.sqhk.co/xubewarow/ahfymTF/13366900673.pdf
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/libepevigimusirujope.pdf
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/7088150.pdf
    • https://cdn.sqhk.co/pujazojiwixi/Cbhfjek/37651613003.pdf
    • http://bagerisevi.scienceontheweb.net/mazanulime.pdf
    • https://mepurukog.weebly.com/uploads/1/3/5/3/135306658/336fc5b1b2e.pdf
    • https://cdn.sqhk.co/lididiregi/viiBieJ/30757430179.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ribibepope.epizy.com/19640252019.pdf
    • http://liraperuwuw.atwebpages.com/g-shock_gravitymaster_ga_1000-4a.pdf
    • http://refufigatuzar.epizy.com/31219316372.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7f.bin
e07e974d2d2f5919aca0d2ee8926c2bf8e9f35df79cef6eb209fe01919b2c871		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 5236 bytes
font_01_sfnt_off0000ed55.bin
8c99f320d9e995b558c54ccffabdf6fb91b74b6a7927ad699601ff3072ef4ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10360 bytes

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