Malicious PDF — malware analysis report

Static analysis result for SHA-256 831ee98228445d3d…

MALICIOUS

PDF

64.2 KB Created: 2021-01-29 12:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e0e3b4a98bd571540f0e62623241285c SHA-1: e502da63e16ec208d10bcd9181a1e41148a7b34a SHA-256: 831ee98228445d3d30e3fe1bd5e37bc636d2049fed89b97ef417e388a4d4a3e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body, though heavily obfuscated, suggests a lure related to a game, which is then used to redirect to the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=idle%20harbor%20tycoon%20incremental%20clicker%20game PDF link annotation
    • http://fruit-italy.space/84451227878aadby.pdfIn PDF document text
    • http://ritixabig.iblogger.org/gewugifovufibutofimenok.pdfIn PDF document text
    • http://vupofapotonez.22web.org/bible_bilingue_arabe_franais.pdfIn PDF document text
    • http://varnisvakq.ru/sefewidazosizokiwutu9rl2b.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/6552995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_600eae8fb2c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fe9aa25e32b7.pdfIn PDF document text
    • https://zigetavut.weebly.com/uploads/1/3/0/8/130814179/9598281.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/vetolosel_zajumo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6003e197d106d.pdfIn PDF document text
    • http://electorat.org/24904186948twxvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_600b130ca2440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485015/normal_5fec16c591de9.pdfIn PDF document text
    • https://cdn.sqhk.co/xexodaxafu/aijKOie/what_animal_are_you_psychology_test.pdfIn PDF document text
    • https://vobajorod.weebly.com/uploads/1/3/1/4/131438629/lekifojefiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubofebagadupa.epizy.com/asoka_all_songs.pdfIn PDF document text
    • http://kuzojepume.epizy.com/44165117540.pdfIn PDF document text
    • http://xofududegotu.epizy.com/guvali.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_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 5416 bytes
SHA-256: 2336b3377e1f1f69c6bf0b1206e532cbedb7a58125ed3a468aa8f411942fe78e
font_01_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10612 bytes
SHA-256: 1d7da52541f983378efe7f0a19b88e244f08cf3363166093b644876071946f22

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