Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8938814316e267…

MALICIOUS

PDF

76.5 KB Created: 2021-05-13 14:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ec35fddb4dfdbdcb6a50da4e23e0f5 SHA-1: c3637aacb3365199b50a4018b718307124fff83d SHA-256: 2f8938814316e267835d5420e0d0d6fb5c547a3b8833fcd42c768486d170c477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to PDFs hosted on a CDN. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation or phishing. No scripts were extracted, but the PDF structure and embedded links are the primary indicators of compromise.

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://cdn.sqhk.co/vilosezuj/hkARcYO/28738793956.pdf
    • https://cdn.sqhk.co/talokelom/cLIgfYv/citadels_medieval_war_strategy_with_pvp.pdf
    • https://cdn.sqhk.co/fukafodifi/iGjf7ia/world_time_attack_aerodynamics.pdf
    • https://cdn.sqhk.co/tokarikadez/4Gzhjb9/how_to_wash_white_clothes_at_laundromat.pdf
    • https://cdn.sqhk.co/dodipenameki/eDOq1vR/happy_wheels_online_for_free.pdf
    • https://cdn.sqhk.co/renosopezare/lifiaid/air_attack_in_turkey_march_2020.pdf
    • http://tifetatujuvib.22web.org/901015295.pdf
    • https://cdn.sqhk.co/sazalevimit/iijgesn/mobile_service_coaching_centres_in_salem.pdf
    • https://cdn.sqhk.co/jajotulix/hScVOja/xaragedovofevufiwa.pdf
    • https://cdn.sqhk.co/fedovipawe/heSQOgc/63293815361.pdf
    • https://cdn.sqhk.co/pimepojuti/hg2PkiR/best_place_for_marketing_jobs_in_canada.pdf
    • https://cdn.sqhk.co/mugolino/Phhhjw2/57216035098.pdf
    • https://cdn.sqhk.co/wikikifigas/eigVA90/zomadikewugojadud.pdf
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/furizizowi.pdf
    • https://cdn.sqhk.co/rifusofuwedi/jkhcdge/missing_you_songs_2020.pdf
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/9710488.pdf
    • https://cdn.sqhk.co/pamomusemida/hhgiKhb/98087995084.pdf
    • https://cdn.sqhk.co/gubisagebuto/Qx1hfu9/45439415718.pdf
    • https://cdn.sqhk.co/setawigiz/jbKwijQ/absolute_rc_heli_simulator_full.pdf
    • https://cdn.sqhk.co/losokifape/jfcKfge/vomunurotomere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=difference%20between%20poisson%20process%20and%20exponential%20distribution
    • http://vizulubafaxal.epizy.com/browser_chrome_android.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_off0000ec20.bin
a1b412a7baf9bc0cdca463a05c1dbacdaf7fa200cea39260482e0736ba14f9af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5448 bytes
font_01_sfnt_off0000fece.bin
1d9f2daa0530ecdad77baa2753ef95e3a73a1fbddb4d0f2108cb23909ae31282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10908 bytes

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