Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c79dae0decc052…

MALICIOUS

PDF

73.4 KB Created: 2021-02-13 07:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 488099e84d48c83401d13796752baea9 SHA-1: ca8c0b08e3b9779bce221d039daf0e0eeb29b023 SHA-256: b5c79dae0decc052d79f3483daeab194fd1fa3ad16a912db4e21875cb39027ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, with the primary function being the distribution of other potentially harmful files via these numerous links.

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://leonvi.ru/123?utm_term=young+champions+cheer PDF link annotation
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/74ddfdf694c7.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/7470428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_6023f3b3ec4c5.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/bisadaluv-kiwajeloloduv-bifuvelezi-zekamixigomiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_6021ccb0328ca.pdfIn PDF document text
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/bifugik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_600ab079d6b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_6018004589d13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5fe297f73e595.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/5678998.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/7915943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fe08abdc2fb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonavijewiw.epizy.com/ugc_anti_ragging_affidavit_form.pdfIn PDF document text
    • http://wumoxafu.epizy.com/knight_of_cups_yes_or_no_answer.pdfIn PDF document text
    • http://beximor.epizy.com/52312559652.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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5276 bytes
SHA-256: 0e3370639810da5155f32580922de6b2ab7638a0cdd81830d10e19a2ef36488e
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 10916 bytes
SHA-256: d6e8a53079d63e875b58b557e2969c6a159b4bf845bd29136afc407c57ba2bf8

Open this report in the interactive analyzer, or submit your own file for analysis.