Malicious PDF — malware analysis report

Static analysis result for SHA-256 780f74a2b75a7297…

MALICIOUS

PDF

67.2 KB Created: 2021-03-25 03:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648ce45ad29fecda0854c622de06bf67 SHA-1: 866388f3babc6ad111ac93a0379dc3c6316e8b9d SHA-256: 780f74a2b75a7297e03ace88f815db36ad877906b604533f4141753055ba2a77
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 ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=lac+operon+worksheet
    • http://maleev.online/digital_tab_2_hard_reset0tme6.pdf
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/zojizewazupo.pdf
    • https://cdn.sqhk.co/duravukikemo/79qhc9W/zelunelelodoregubufawi.pdf
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/jomebujini.pdf
    • https://cdn.sqhk.co/lakanodip/dgfj1jg/parkour_race_mobile_game.pdf
    • https://cdn.sqhk.co/jaziwuke/hjahg8O/90060016054.pdf
    • http://uorott.com/fujemuneruwibzcgt.pdf
    • https://cdn.sqhk.co/zaweniwefi/ihcH5A8/wogex.pdf
    • https://cdn.sqhk.co/fodexuxefeba/7lFijlW/merge_rush_z_mod_apk_android_1.pdf
    • http://xefofefejal.iblogger.org/85682307192.pdf
    • https://cdn.sqhk.co/vitimosugu/ajgijib/live_price_of_oil.pdf
    • http://myirn.icu/wuborogazixixd0iy.pdf
    • https://cdn.sqhk.co/tikomekove/ibgeihh/adobe_premiere_rush_pro_apk_full.pdf
    • https://cdn.sqhk.co/tizalenifo/7BeiMhi/geometry_wars_retro_evolved_pc.pdf
    • http://dream-stat.ru/953453044589w2pk.pdf
    • https://cdn.sqhk.co/jesotipo/cv7iezS/24849648568.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zuleturibalege.rf.gd/contrato_de_fletamento_maritimo.pdf
    • http://mujunuge.rf.gd/android_phone_tracker_gmail.pdf
    • http://nakuzipob.rf.gd/how_to_check_allison_transmission_codes.pdf
    • http://zizokeb.rf.gd/xiluxizo.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_off0000cbc2.bin
f320cd9ba55097caaf48e5dec95fcf58b1e5fac17e9b2e1154d8372b9647c367
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 5088 bytes
font_01_sfnt_off0000dd22.bin
b868cc1b5289f99deec7527dce44281eedab5c92338a20ec5659b77d78e3d32b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 10076 bytes