Malicious PDF — malware analysis report

Static analysis result for SHA-256 f552350009838a97…

MALICIOUS

PDF

79.2 KB Created: 2021-02-25 16:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bffed62a08b2009aed2e6984b84e1c29 SHA-1: d10ea3548a4e7723b0bf6759c08c69ba68520e18 SHA-256: f552350009838a979155eb198f4a16535248ea2f0aa637624f823a144801caee
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to deceive users. The primary URL, 'https://leonvi.ru/award?keyword=is+an+instant+pot+the+same+as+an+air+fryer', is presented as a search result, indicating a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=is+an+instant+pot+the+same+as+an+air+fryer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ffdc51b83af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_602705c98886d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_602fab2c54b0a.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/igTghjh/classic_car_racing_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/1Cibfcx/kitikosetegofozapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_602fe56ce457e.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/2603683.pdfIn PDF document text
    • https://lifonupulov.weebly.com/uploads/1/3/4/8/134893434/biradutilovip.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/FRidDha/livutezoberaregujigas.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/ifChh7q/wokolobenevekav.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/svjgAgf/ugandan_knuckles_do_you_know_da_wae_sound.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/5856078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff3b07147308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fcf81401b0de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_600b227a85968.pdfIn PDF document text
    • http://gapejeg.22web.org/kado_the_right_answer_episode_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_5fd28393bc12e.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://melitere.epizy.com/punctuation_worksheets_for_grade_2_cbse.pdfIn 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 4936 bytes
SHA-256: 32c56e8d12836f3114d4035f651f115a4854ae5a12f363b0cd317c9e28d1d2d3
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10372 bytes
SHA-256: d9e860319b76bd1b28a1979c30066d848674b7033f8e4f59d7d941423b56e42d
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c