Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f32b63abcc1602…

MALICIOUS

PDF

92.9 KB Created: 2021-04-12 05:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40652f4f8137ce7dd5c0a247cee5f101 SHA-1: 7628fc37795512371e0fc9471aef37ca59d2641f SHA-256: 12f32b63abcc16029dcaf2cd71f9e81c6429cf0f8e36ba751b0984ab17b8231c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or malware distribution lure. The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to obscure the ultimate destination. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://jacksth.ru/strik?utm_term=reddy+heater+parts+breakdown
    • https://puneliten.weebly.com/uploads/1/3/4/0/134040782/rubetikew.pdf
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/23637af979f7a1.pdf
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/xufeniwotifij.pdf
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/8201b08d8.pdf
    • http://besiditiduw.22web.org/wordly_wise_3000_book_5_lesson_2.pdf
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/271c01a.pdf
    • https://misikozi.weebly.com/uploads/1/3/4/4/134443183/wafaje-gajurivupaxuti-napuluravubug-jezabebewolot.pdf
    • http://sukovuxelex.22web.org/benefits_of_social_media_in_education.pdf
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/rajejoferaju.pdf
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/561966a.pdf
    • https://muwemobivom.weebly.com/uploads/1/3/0/7/130776082/bizefip-todavifu-wolabafa.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/bitowefu_dajise_podepaku.pdf
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/d772e719e10.pdf
    • http://xekevixuvojiw.22web.org/hernia_ventral_gigante.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a2e1ada0-5c5f-48d4-ac2b-905287f5bccf/susaxunomilagikubanakuguk.pdf
    • https://uploads.strikinglycdn.com/files/e523ff10-7b3d-4041-94d1-3182d5e53325/siwaxenura.pdf
    • http://tekoboworitutew.epizy.com/8172979735.pdf
    • http://kugefosames.rf.gd/dujisusevivivit.pdf
    • https://uploads.strikinglycdn.com/files/d20f5b71-fffb-42b4-bb37-fc8c14468497/15113277803.pdf
    • https://uploads.strikinglycdn.com/files/495b49a7-568f-46ef-bd62-30733711fa30/woliv.pdf
    • http://gufaxepelirub.rf.gd/31455439009.pdf
    • http://xukuzamasiv.epizy.com/gujeb.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_off00011d75.bin
a943a44bf6c3c337c49a234f62f0e1a44e1f69259cd5382c711207dd44a51d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 5160 bytes
font_01_sfnt_off00012f03.bin
a002ec8169481df1a5397ffd138f8a1547e5d64909698b9124f5c703f9af195d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 12048 bytes
font_02_sfnt_off000157aa.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x157AA 4324 bytes