Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a73810e5da539ae…

MALICIOUS

PDF

70.3 KB Created: 2021-02-26 23:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a60d248fb365e210980c41044c3600d9 SHA-1: 4c05b6f0e45ed0c9fb5d399236c3723f699d5e1e SHA-256: 9a73810e5da539ae63f5b4642cda1cf72f36f9c9fcdd8921d82983f8021d3e03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the embedded URLs. The document body content, though partially corrupted, includes a deceptive title related to piano chords, which is likely a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=acordes+de+piano+canciones+cristianas+pdf PDF link annotation
    • http://carluxepaint.site/introduction_to_philosophy_classical_and_contemporary_readings_8th_edition_onlinej3zvt.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/bUfcyhc/buwidawerozujegijixuzemid.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/fhbdQgj/dusewewuwebarimajul.pdfIn PDF document text
    • http://idclick.cash/messenger_apk_uptodown_para_android8vqop.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/G1djbQE/zombie_apocalypse_paintball_hayride.pdfIn PDF document text
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/d6f61dcbcb3bc40.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/clAhfja/zesokisuwuk.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/7086039.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/g0vhbja/marketing_planning_process_steps.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/6336160.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/ejjVijV/48840165339.pdfIn PDF document text
    • http://sbrf.link/pirenitjue6p.pdfIn PDF document text
    • http://ig-socialmedia.xyz/25217239062kpjxm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/palevijuj/11552426596.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/vidmate_hd_2018_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/suara_burung_puyuh_hutan.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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 5104 bytes
SHA-256: 31127001038cb9fac07f0743eb967648612d50ad7af18ac09f5790df9a003930
font_01_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 11332 bytes
SHA-256: 77c85f362c47f3e699b8d7be721e09da50f57d915e31c0f1e278c370e094101c

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