Malicious PDF — malware analysis report

Static analysis result for SHA-256 839987ec2d274860…

MALICIOUS

PDF

70.9 KB Created: 2021-01-10 11:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f756bc3f0486cb6dca826fa39993c551 SHA-1: 51a7201a773e715d6f0fae13332808320b51a8f4 SHA-256: 839987ec2d2748605b8f4038d8d15c1200e6747bbe34ddf053084011e23eda36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. One prominent URL, 'https://traffking.ru/aws?utm_term=cartoon+movie+making+app+free', appears to be a lure for downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffking.ru/aws?utm_term=cartoon+movie+making+app+free PDF link annotation
    • https://cdn.sqhk.co/jeposanop/rhahahi/usiminas_usinas_siderurgicas_de_minas_gerais_sa.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/1222848.pdfIn PDF document text
    • https://site-1177722.mozfiles.com/files/1177722/77218144082.pdfIn PDF document text
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/6150352.pdfIn PDF document text
    • https://vanasukir.weebly.com/uploads/1/3/2/8/132815930/wibemedozeriju.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/3453114.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/gjhih5L/bike_riding_on_the_west_side_highway.pdfIn PDF document text
    • https://site-1178950.mozfiles.com/files/1178950/84471910195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f9c5e1978688.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/0d04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_5fc12f30afd47.pdfIn PDF document text
    • https://site-1199794.mozfiles.com/files/1199794/44960177024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8773ff2347d.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/biwubeleba/mozepekenikigegojitedabef.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5040 bytes
SHA-256: 3584d5e1a4bb3f325a10328aaa5665de000645094030968a69f1db4ff4a8a58d
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 10540 bytes
SHA-256: 77bfcd989ed27cbf6c73a7c348f8fb7d4633f2b849940e1cb299dd1508a88c76

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