Malicious PDF — malware analysis report

Static analysis result for SHA-256 105a2790dc9f0c74…

MALICIOUS

PDF

83.9 KB Created: 2021-03-30 23:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64db21b4b6bec1143dcc8b2c04bda6a1 SHA-1: a7f82acc66f1d648a9ff52034e221f1a11d6f4eb SHA-256: 105a2790dc9f0c7480532c747a9265a65aadc400a0dc9564d93dcc2bbb8e7027
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'midufefew.ru', suggesting it functions as a lure to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to relate to 'how to reset i9s tws airpods', a common pretext for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=how+to+reset+i9s+tws+airpods
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/vavoruratamosemumuna.pdf
    • https://cdn-cms.f-static.net/uploads/4489583/normal_6046dacada8ec.pdf
    • https://cdn.sqhk.co/wajerewuwer/0jdjeoM/tirenagajiz.pdf
    • https://wemowojek.weebly.com/uploads/1/3/5/9/135993501/6804027.pdf
    • http://xuwuvewisin.mypressonline.com/65147667065.pdf
    • https://cdn.sqhk.co/nuvaratuji/jeigKjh/play_4_numbers_ct.pdf
    • http://maska-respirator.com/house_music_top_100_all_timei37hf.pdf
    • https://cdn-cms.f-static.net/uploads/4383322/normal_603e9d5270d39.pdf
    • http://kafofal.mygamesonline.org/ang_wika_at_ang_lipunan.pdf
    • http://instahelpforbusiness.com/46190684928a6hdi.pdf
    • https://cdn.sqhk.co/zeterabaxax/5tDgcog/makelukazon.pdf
    • https://static.s123-cdn-static.com/uploads/4388271/normal_5ffd0fda25578.pdf
    • http://bagesopabiwub.scienceontheweb.net/46436981891.pdf
    • https://cdn.sqhk.co/sokaxopoje/iHp6Oua/78698542292.pdf
    • https://cdn.sqhk.co/baxajufim/eDEVChd/29834461493.pdf
    • https://cdn.sqhk.co/detaludolef/jhbjaii/40024310675.pdf
    • https://wimavikuwoj.weebly.com/uploads/1/3/4/6/134698125/e159db46ba96e.pdf
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/xulisezaj.pdf
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/surufulexogelopos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zilisidojaze.myartsonline.com/ritug.pdf
    • http://vegubom.atwebpages.com/acyclic_compounds.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_off0000faec.bin
e82c29e3758b5b4ae51ac66d5ecc62b9b5d4f90044a96683c8bcf00eed589bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 5128 bytes
font_01_sfnt_off00010c75.bin
df9ad980d551671298a63674f4c4129b2751491c53b4e8e14febe315b188c12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 23608 bytes

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