Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1c6f5f81841476…

MALICIOUS

PDF

75.6 KB Created: 2021-03-15 12:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b4bcb676607a0e80b6fc6bea308e768 SHA-1: 56b2a39ffbc4f39b1e4e0fee8d6f5ff2727d62c4 SHA-256: ac1c6f5f81841476b04d290d0312955de70ec514df261466ff5a2396dc5bd145
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, including one pointing to 'zajinet.ru/strik', suggesting a phishing or link-farming attempt. The document body, though heavily obfuscated, appears to be a lure related to workplace safety, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=safety+awareness+in+the+workplace+examples
    • https://cdn.sqhk.co/zekuxemelop/Vigjjet/three_kingdom_mighty_superhero_mod_apk.pdf
    • https://cdn.sqhk.co/niripakexad/cghgcPL/guideline_401_k_fees.pdf
    • https://cdn.sqhk.co/juzureniwibu/1Dfhcja/mario_kart_7_online_races.pdf
    • https://cdn.sqhk.co/divoxisig/xW9kpic/70705256859.pdf
    • https://cdn.sqhk.co/lamiwifa/gfgcMjg/zenonia_5_download_apk_offline.pdf
    • https://cdn.sqhk.co/pajazidif/4Q5NjPY/city_island_builder_tycoon_apk_mod.pdf
    • https://cdn.sqhk.co/wuxobilan/jcwh3gj/kotezufekaxawopoboxikol.pdf
    • https://cdn.sqhk.co/tatidukigag/jhcrhjm/nupinalebewebezam.pdf
    • https://cdn.sqhk.co/talokelom/cFuhc33/real_highway_car_racing_mod_apk.pdf
    • https://cdn.sqhk.co/pasivuzuke/ehcdids/64571623656.pdf
    • https://cdn.sqhk.co/rovifatira/q7hfhfN/nova_launcher_prime_apk_uptodown.pdf
    • https://cdn.sqhk.co/kibedutej/hghbahd/fastest_bowler_in_cricket_ever.pdf
    • http://lerimofo.mywebcommunity.org/59085870890.pdf
    • https://cdn.sqhk.co/surodamiz/hayIagh/40602860977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_61230a5b40a043f6a23793cb2dd6916d.pdf?index=true
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_b3ea39e141ec45148b4c6b8c000e164e.pdf?index=true
    • https://s3.amazonaws.com/kizugokofo/caltrans_standard_plans_2015.pdf
    • http://rixigor.onlinewebshop.net/wabipesitekikegoju.pdf
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_569fc4edef4148a6b96ebf40ace6a6ef.pdf?index=true
    • https://s3.amazonaws.com/dumupa/ridovurowomazawumovud.pdf
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_54ae31eee37b4aa1a25a609d3086319b.pdf?index=true
    • https://s3.amazonaws.com/pafexegud/the_greatest_salesman_in_the_world_part_2.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_off0000e89a.bin
23af8fbd63006bae8d64516178657ee0615ae6c1b88ac78cee0486c8fe58ae68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5684 bytes
font_01_sfnt_off0000fbee.bin
6b97b8253e5459a9d2534df7d24bb4c2720fa402f5d0cdbfa4e7acc185191f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 10392 bytes

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