Malicious PDF — malware analysis report

Static analysis result for SHA-256 638b6801d77fcf65…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 19:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4715dcc02adb2225b1945b310f5e9ad7 SHA-1: e084727f5fce46c65f67657e64e109055bda7e6f SHA-256: 638b6801d77fcf657ccdc04b4f42744d2514610f4b500b0220a078139ca59c19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/123?utm_term=medicamentos+barbit%25C3%25BAricos+pdf
    • https://cdn.sqhk.co/xafigozenusu/PFNijii/efootball_pes_2021_pc_review.pdf
    • https://cdn.sqhk.co/setawigiz/nAhfhci/negesapogisorawarijaludu.pdf
    • http://jepowoxudo.iblogger.org/jirisat.pdf
    • https://vuveresob.weebly.com/uploads/1/3/4/5/134589217/napugowupel_nisowun_favavu.pdf
    • https://cdn.sqhk.co/xagegegozi/eDnXijX/clearway_band_gig_guide.pdf
    • http://instacopyrightcenter.com/asme_y14._5m-_1994_freel9kfr.pdf
    • https://gojefizabefav.weebly.com/uploads/1/3/4/8/134890321/491475.pdf
    • http://nominasacra.ru/toca_life_apk_free412q8.pdf
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/37751.pdf
    • https://cdn.sqhk.co/jawezumate/hjS5ieC/wadufoge.pdf
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/zenuxanirofikijed.pdf
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/livavuwaxe.pdf
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/gozolerolajise.pdf
    • http://nusukopov.22web.org/merubujurofurokamalab.pdf
    • http://tubiwupijekowam.22web.org/4309955659.pdf
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/rusepafabilisetudar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dajajubofu.rf.gd/free_budget_template_personal.pdf
    • http://fekirufelite.epizy.com/uses_of_aromatic_hydrocarbons.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_off0000e4e5.bin
5ec67d1045161b286f06b9bf1c00d6cdedcf23c19e3a8b66d4b228fa8d985d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5532 bytes
font_01_sfnt_off0000f76f.bin
817b34214d3ce1174d06d44c1bf9671b0cd16662aba00edb7ed3cb0e51c7708c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 11296 bytes