Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ef077fee11e1a…

MALICIOUS

PDF

76.0 KB Created: 2020-12-28 11:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0a955e099c91718ff0b4eda85da8cbf1 SHA-1: 9dcca0f4be9abbd42fe7965ee3317fe34af10c44 SHA-256: bb4ef077fee11e1a9759227e93e93b2f4fc810a8318e1fc0aa1a11e999dc3c38
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a redirector link to 'traffine.ru'. The PDF contains a large number of embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or scam campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=somatogenic+pain+definition In PDF document text
    • https://cdn.sqhk.co/pupevadojas/geidgeB/jafovixumanutanafemuvil.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/5d5d6aa9267.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/jhgcbNS/52448599515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_5fa5c53ea6482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f8e78cf47d2c.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/19d342ab3b9810.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/gufegudipejabeko.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/8926136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_5fd9ca1b54ac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe4ead61e1fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fca9ebd5292f.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/jamokaroxoj/36730910683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556d3091-a9c2-4070-99cc-5566efae29f0/americas_history_chapter_20_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/syphilis_treatment_guidelines_penicillin_allergy.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/14295828173.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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 5272 bytes
SHA-256: 6c9aef6705adedd2caa7ae590675df6c1419e366424df223709ca017465c6580
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 10412 bytes
SHA-256: 10270518c5dc2e55bd836f572a22937954ab9e21cfbfcaed392c94c26a6b600b

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