Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32511062c5f179…

MALICIOUS

PDF

76.5 KB Created: 2021-06-07 16:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7ea2268002ce9c1b5a6e9a152b94b53c SHA-1: 5c8bff398f833c5ca02f50cc01303304dc3910c4 SHA-256: ac32511062c5f179525f2a701e31e2e8c060e76af49698b652bf8585811449fc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The presence of numerous external PDF links and the use of UTM parameters indicate a coordinated effort to drive traffic, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=pentatonic+scale+guitar+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468831/normal_6015ef5355477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_60b7c5200d4bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411701/normal_5fe1107338468.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/321300.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403959/normal_60b39b85ac26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_603328ac1328e.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/dd78768.pdfIn PDF document text
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/fokalufe.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/vilamibolulatujujaj.pdfIn PDF document text
    • https://puwubebuserow.weebly.com/uploads/1/3/4/4/134403982/moboz_nubizumozeveso_kavej_xunofi.pdfIn PDF document text
    • https://devoligoj.weebly.com/uploads/1/3/7/5/137509872/5888718.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/d7fb8a94.pdfIn PDF document text
    • https://tuxilumamiwuwuw.weebly.com/uploads/1/3/4/5/134582020/delaxedokuju-kuferenod.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/fuzonin_lafaxunazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55770b42-d18c-4746-b9d6-d335240aad4d/gubosogezevomisinibowij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c8d7e0-4708-4ae5-986d-7074ce2f5d84/how_to_reset_check_engine_light_2013_silverado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8275255-b84d-40f9-99f0-7f5b25d951f8/27993255407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc530faf-e67c-4d50-8242-743ed5d92311/zuwutologuwug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcee0e0-58d7-4064-a9d7-f6501f40d6a3/mastering_the_grade_8_social_studies_teks_answer_key_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e75b3e0-4a02-4f2f-ae97-178b6e3e4af6/lefuninofipilozajegafaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41485d41-3010-434c-8fa0-c550b7e4a4a2/borinuwipusemagopo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5392 bytes
SHA-256: 82a2542b9244218c8a4b88fd99a2e114fb8e960eedb58288c81c70cc3341e473
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 10944 bytes
SHA-256: c0f7b8fbdf52e170c1887e6c278278a6d9e31a456b7e5e36a18640805a477ca3