Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d003de029d9793a…

MALICIOUS

PDF

80.1 KB Created: 2021-02-26 16:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ee7a58fcb2ee61cc3d85b86e1689de SHA-1: 8042e011948ade16e9422aa7a95eb401976e4cc4 SHA-256: 5d003de029d9793ac66873715e62be6e79742e4fdd92a1910c7652b75087ec2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://nipisod.ru/strik?utm_term=english+grammar+exercise+book+with+answers+pdf
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/gerimuwojute_vilip_savusi.pdf
    • https://cdn.sqhk.co/wixefawoz/jfABjb5/babeluzimaritetexoxegor.pdf
    • http://ronifibofizet.medianewsonline.com/tav_prasad_savaiye_fast.pdf
    • http://doxalasi.mywebcommunity.org/52486882553.pdf
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/vanigirovetoxi.pdf
    • https://static.s123-cdn-static.com/uploads/4404502/normal_5fe30e524b8d1.pdf
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5fe4ddc52c117.pdf
    • http://pazujiz.mygamesonline.org/dd_online_free_play.pdf
    • https://cdn.sqhk.co/ruwonumatag/2idhbhh/cars_movie_poster_free_candy.pdf
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/kewetid.pdf
    • https://cdn.sqhk.co/xiwasazafu/lmha5Ee/vitexojenimirowuripom.pdf
    • https://cdn.sqhk.co/javomekoru/jeigjjd/magic_fluids_hack_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gezetega/fusafuvujurekagafuxanuz.pdf
    • http://lowazuxakosilal.epizy.com/33354686275.pdf
    • https://s3.amazonaws.com/fadobirak/jafegi.pdf
    • http://dovagoxaluzof.rf.gd/gutusetumopawebanikef.pdf
    • https://s3.amazonaws.com/xozeb/sogutupoxuvileg.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_off0000e868.bin
cb7f8f774cc51fe1a3aa30252747df149ba57fdfc501e5d0ee157f0b411d73bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5676 bytes
font_01_sfnt_off0000fb8a.bin
8a38dd31488c2ea925b212a3da8e6598d4d5cb8630334d1771fcfdf28a1da974		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 11732 bytes
font_02_sfnt_off0001230d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 4324 bytes

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