Malicious PDF — malware analysis report

Static analysis result for SHA-256 5246587b94eb01d6…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 15:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b80a491050b9e11f6b00a74b2b2f88e5 SHA-1: bdc605beddb89fd34875548c6d7fa1586b789d1d SHA-256: 5246587b94eb01d659b103689d8970594cc5654f38e1cdd6ee0744deaf8e5340
146 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious platforms, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains keywords like 'blow up phone with texts free' and references to 'wkhtmltopdf', indicating a potential lure to a malicious service or scam.

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kuzutuzo.ru/wix?keyword=blow+up+phone+with+texts+free
    • https://cdn.sqhk.co/xemugugafot/hcgdgcB/english_20-_1_reading_comprehension_practice_test.pdf
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fecd3515efd8.pdf
    • http://lobabinuladeri.medianewsonline.com/87562677684.pdf
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/3b3e8d2f6.pdf
    • http://vuwefedope.sportsontheweb.net/zixilakikigunizosevizurog.pdf
    • https://cdn.sqhk.co/legusovej/okjKJoe/juwoter.pdf
    • https://cdn-cms.f-static.net/uploads/4371240/normal_603249ec176e2.pdf
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/xepoxuxi_dunatol_dapijaduzoma_datopapimij.pdf
    • http://ligugiban.scienceontheweb.net/a_geek_in_japan.pdf
    • https://static.s123-cdn-static.com/uploads/4377380/normal_60052e81ae0db.pdf
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fe7ccc31edc4.pdf
    • http://gafuvufafokujop.sportsontheweb.net/gavabijozabimurerijonuw.pdf
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fecf01322e22.pdf
    • https://cdn-cms.f-static.net/uploads/4495059/normal_603e5fa61da67.pdf
    • http://zelumefepa.sportsontheweb.net/lejesix.pdf
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5fcd33cd6085e.pdf
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fd1aa8c35179.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jopubijako.atwebpages.com/wendys_junior_frosty_nutrition_information.pdf
    • http://jupevesu.atwebpages.com/pinel_and_barnes_biopsychology_10th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb32.bin
1568f5297c51af9ea198397f5878a27658d16b5f4ad1e6061fafab645f6b930b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 4868 bytes
font_01_sfnt_off0000fbcf.bin
bc5383555584fd6618df324c7479799753b995e5e37fdebec6d598761984d945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 11160 bytes
font_02_sfnt_off000121c0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 4324 bytes

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