Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52fdea70ed40656…

MALICIOUS

PDF

113.9 KB Created: 2021-05-09 22:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad737c243e6e8c7a3dd1d229efdd101a SHA-1: 10a98df372a56c8f66129d44b538bfd70f4919b9 SHA-256: a52fdea70ed4065662415b43bb4409932fd0a5023c338baf2ffa375578e3b409
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, references a carburetor diagram, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=96+polaris+425+magnum+carburetor+diagram
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/4068e4ba620e45.pdf
    • http://garanibukumom.scienceontheweb.net/zawedaguzo.pdf
    • http://nelodagavezes.mygamesonline.org/luxazolipibef.pdf
    • http://wikowezenitezo.medianewsonline.com/juxokupowikevuxiwomuvi.pdf
    • http://rawoxaxevog.mygamesonline.org/10031836425.pdf
    • http://luvetikemo.66ghz.com/64131937065.pdf
    • http://thechambre.xyz/tubowobjydvq.pdf
    • http://lalat.space/fitness_watch_reviews_consumer_reportsxuy32.pdf
    • http://digtalcaliper09.xyz/graphical_user_interface_programming_with_cplwks.pdf
    • http://ijmalan.xyz/jipunuvurejujawavusufec2mf.pdf
    • http://xepuxupipe.mywebcommunity.org/13906766843.pdf
    • http://rarebuzoxexovom.22web.org/20219689657.pdf
    • https://kulexixujida.weebly.com/uploads/1/3/4/7/134723957/f00be3c2a.pdf
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/tijunofugafunesom.pdf
    • http://sberbank.link/swtor_cartel_coins_freerut7o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://burupilejeg.epizy.com/xutovirorijapidaguwal.pdf
    • http://kefitiruw.epizy.com/90170491032.pdf
    • http://sidiwen.epizy.com/aranjuez_concierto_score.pdf
    • http://totawuvibewe.rf.gd/atomic_bomberman_1997.pdf
    • http://mezureda.rf.gd/zenutunulavumil.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_off00017b28.bin
93db890c3637e1e472a85123f758a09f7ff55e9604b2678f8463b7b0ee52ab68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B28 6092 bytes
font_01_sfnt_off00018fbf.bin
2ac944d9b21b0802f5f144238e8dce23dddf9c39e1a143e5420565ea312368c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FBF 11760 bytes

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