Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ed8c59b54a8e6a…

MALICIOUS

PDF

67.6 KB Created: 2020-12-14 01:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d01a4ffc3a35b086335b3c10ec74d9f6 SHA-1: 90c74019b92d50c4330fc890716f232d79a65491 SHA-256: 73ed8c59b54a8e6a1b92466e75a94066bac14f93f9ade68d2789b464957aaab2
184 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 multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure at 'traffking.ru'. The document body, though heavily obfuscated, suggests a lure related to 'human anatomy atlas 2017 pdf', likely to entice users to click the malicious links. No scripts were extracted, but the presence of redirector links indicates an attempt to lead users to harmful content.

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://traffking.ru/aws?utm_term=human+anatomy+atlas+2017+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5f96bc9317403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8b08f653634.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/2500699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5fca19a02d5db.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/d71bbb97a352e.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/a4711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fab2e7600afa.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/8748603.pdfIn PDF document text
    • https://pikotefomulig.weebly.com/uploads/1/3/4/3/134317367/defoxunorip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fa5ded410fa4.pdfIn PDF document text
    • https://xidozuju.weebly.com/uploads/1/3/4/5/134597445/3e55d599da6b1bd.pdfIn PDF document text
    • https://jaxuguduju.weebly.com/uploads/1/3/4/4/134442137/nunosozewi.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/b512bbdd-77f3-4ab4-8b14-d1103964f096/75483706346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e12d8a-a641-4728-8e72-8374557a9949/53014212881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a172e089-c834-46ed-a45b-99f2838e08f1/world_history_patterns_of_interaction_chapter_32_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973ad7bf-81e7-42d9-b2dd-aaac3d2fe69e/43732752124.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 8

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_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 5560 bytes
SHA-256: 1781622fcd55eba828acd61f6d8409b1ff43c1b6ab34839020fb469d51ac43d8
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 10676 bytes
SHA-256: f396864c994beb662558c4baf398a3e8f7600b905e873d0681aa5cbc4f93c802

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