Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e15819eab2aa36f…

MALICIOUS

PDF

67.7 KB Created: 2020-11-27 04:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed92cfb1047038c1e7e2a4d6f449e7c0 SHA-1: 12a1eaf92bae722ca86d366babeda62be5a8f869 SHA-256: 9e15819eab2aa36fe6812727148a8457a9107716487027a3e3ac9d5bb843e304
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely hosts malicious content. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and the overall structure strongly suggest it's intended to redirect users to potentially harmful websites, 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://trafftec.ru/aws?utm_term=chicago+format+purdue+owl PDF link annotation
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/0694954a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8f50096bca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f91e409a30a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420588/normal_5fa36bef82d55.pdfIn PDF document text
    • https://ruwusugotalub.weebly.com/uploads/1/3/4/6/134690364/a211b45d8c882.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/fiwuzewawefujeb.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/wemejidomab.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/2bd1494647f5f38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaloto/forepokabuwematexazasaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f2416f-33f5-4e45-bd62-3e88ab3fa1ba/lawifelasawetoxud.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/ridibaridoxutesaleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb69ecdc-03bb-4a9a-b11c-741e6fd78fb5/physioex_9.1_exercise_4_activity_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f935d9-6173-41c2-ad73-3ae2b5166f6c/adjetivos_posesivos_worksheet.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 5388 bytes
SHA-256: dcef678714a5ddfb1fde1900a273175ca914fd244265e7c6c4b3089038bfb132
font_01_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 10824 bytes
SHA-256: b2ca26e7bd671c1a594e0c24f7ebe20988c562d55c00c3c5865dec18cc1844f1

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