Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3430dedbe35e116…

MALICIOUS

PDF

83.1 KB Created: 2021-04-06 00:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb8a7f673482d4349623f54e2e3402a SHA-1: 5210a89c4e41e2a62cac3166f8617b96f16f5d49 SHA-256: a3430dedbe35e1165f74ccd71c393d042285181a5042421207bc41eb61070873
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution attack pattern.

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://golowaki.ru/strik?utm_term=what+are+the+best+powerline+adapters
    • https://cdn.sqhk.co/mujowofapubi/haighhA/war_of_the_gods_dimatik_lyrics.pdf
    • http://dimopun.mywebcommunity.org/84768567694.pdf
    • http://lnstagram-verifedbadge.com/the_motley_fool_uk_investment_guideu7bcy.pdf
    • https://cdn.sqhk.co/jigavozef/ggjhaWZ/hit_you_with_the_woah_mp3_download.pdf
    • http://hamsterbig.com/how_to_change_a_garmin_watch_strappnkmq.pdf
    • https://cdn.sqhk.co/mugejufunij/tecjhgi/hercules_roadeo_rampage_26.pdf
    • http://kemikavar.mypressonline.com/conjunctive_adverbs_list_and_examples.pdf
    • http://goproits.com/41370727257d2del.pdf
    • https://cdn.sqhk.co/sobexofap/v53hjgi/xozugudedorubozokezotepap.pdf
    • http://dosubodanes.mypressonline.com/nazavajik.pdf
    • http://soxexuv.iblogger.org/78019429879.pdf
    • https://cdn.sqhk.co/nilesatu/3chhhhi/direct_indirect_speech_examples_answers.pdf
    • http://instacopyrighthelpteam.com/sense_and_sensibility_jane_austen_reviewte0tz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tenurusimuxu.epizy.com/sawugamow.pdf
    • http://sukijikulo.epizy.com/86765191230.pdf
    • http://fuxodenajakifut.epizy.com/rashtriya_khadya_suraksha_yojana_form.pdf
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_f1ac35decc4b40b3ac5fa3f839865781.pdf?index=true
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_4b7f52e841364a48997491d21b725294.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_7305ff61b26641dd83dd6b66009229e1.pdf?index=true
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_3c8090ef232c481b8e5a245e2e9367e2.pdf?index=true
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_efbb7095db39454abac8ee4b1fa21885.pdf?index=true
    • http://wemosoxa.rf.gd/champ_bengali_song_mr_jatt.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_off0001086a.bin
0923beffe76df95a05586ca683e12231790f566361aca0aae47264e3a47356c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 5292 bytes
font_01_sfnt_off00011a6e.bin
d06075be6830718e7d9f07c1ff1e299112bc193edf9fbd0f961452b8a83c19f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 10720 bytes

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