Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0daf0125adbf5bf…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 07:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c356bfa38249397a949cbce7ef4f0adf SHA-1: 1656d0ce19caedb84708be175a5f6f04a7cdeae8 SHA-256: a0daf0125adbf5bf4e7b5aa93321b7eb56fc0bb29e459c6754050986b314b55e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains, and is flagged as an advance-fee scam lure. The document body, though heavily obfuscated, appears to contain printer-related keywords, suggesting a lure to disguise the malicious intent of leading users to scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://leonvi.ru/strik?utm_term=hp+laserjet+m1212nf+mfp+printer
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/xumomexuviwuv.pdf
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/34faba800.pdf
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/6140193.pdf
    • http://pifafixejizigu.scienceontheweb.net/rational_choice_theory_in_political_science.pdf
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/gitisob.pdf
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/ee29816.pdf
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/061aa280a39f.pdf
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/4243938.pdf
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/2701886.pdf
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/8513061.pdf
    • https://cdn.sqhk.co/dilipokoje/8iejghe/spin_the_bottle_questions_for_friends.pdf
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/8303554.pdf
    • https://cdn.sqhk.co/lojeliju/ghJAibZ/download_game_shoot_strike_war_fire_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_d6ac059c36654cb89ae88fc31c206f3c.pdf?index=true
    • https://s3.amazonaws.com/mogedozara/elkhorn_slough_fishing_report.pdf
    • https://s3.amazonaws.com/dinilederu/ipad_app_store_not_ing_apps.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_0d2023648dc44ce097a517ff7eb6416d.pdf?index=true
    • https://s3.amazonaws.com/xetasif/last_reported_case_of_zika_in_fiji.pdf
    • https://s3.amazonaws.com/mexesazaxasa/72437653458.pdf
    • http://tavamikilav.myartsonline.com/forezagekonimesofadedigo.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_off000104df.bin
35be3c4653c63a4fdbf5343fbd75a6002e7350893fe926589de2b81fc3cdd4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 5268 bytes
font_01_sfnt_off000116bc.bin
ade3a6bc3b5d24a5004bd93c46ea606a98ee7e65b88704f01a06b73ac75fc198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 10944 bytes

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