Malicious PDF — malware analysis report

Static analysis result for SHA-256 e664325b885a6c1c…

MALICIOUS

PDF

83.6 KB Created: 2021-04-17 13:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a58a1f7ff1e61255c52b2482a51c41bf SHA-1: 156894424c2c7aa00c8db0b4dee1604e9dcd29e6 SHA-256: e664325b885a6c1cc80fe71c237aff33b1c44ede3410f03813d8338d33345135
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as a credential phishing lure, impersonating the 'target' brand. It contains a large number of external links, many pointing to disposable hosting services, designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation to deliver a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/juwolorepenukil-kasabexi-fudazere.pdf.
  • 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://zajinet.ru/strik?utm_term=briggs+and+stratton+vanguard+valve+lash PDF link annotation
    • https://cdn.sqhk.co/moserusoba/jcgjVhi/50404278351.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/bigigjc/38199064275.pdfIn PDF document text
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/juwolorepenukil-kasabexi-fudazere.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/cgdhioT/murder_mystery_castle_fortnite_code.pdfIn PDF document text
    • https://cdn.sqhk.co/pisimebuziz/ihgd0eY/8457228003.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/nozepoxefepizi.pdfIn PDF document text
    • https://wokepugef.weebly.com/uploads/1/3/4/9/134901336/8bc9a.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/hhdiiFT/marble_legend_game_apk.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/8d479b.pdfIn PDF document text
    • https://cdn.sqhk.co/besimiwi/dihjfid/6131958482.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiseleto/gjPggyQ/49547426801.pdfIn PDF document text
    • https://sagaragevuba.weebly.com/uploads/1/3/4/6/134685912/1604871.pdfIn PDF document text
    • https://pitalozel.weebly.com/uploads/1/3/1/3/131384414/nazadakabemunam-gafavafow.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/4PGohhZ/pevalalamebezirim.pdfIn PDF document text
    • https://takixonit.weebly.com/uploads/1/3/4/8/134899966/7912370.pdfIn PDF document text
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/2316414.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/7GDhfgh/73876083616.pdfIn PDF document text
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/9766956.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/bEgjage/41930402562.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/hfHTjbi/pepufer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 5076 bytes
SHA-256: 1eb67db432bb64c12092a6205ea938f52f9e9b24eb9a28eca9cc4f232ade85ca
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10964 bytes
SHA-256: 25cbbf95023633ac8a2e454007c7090b7ea741e15cba2753e34df50cd8e8e299
font_02_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176