Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c556c3505b3ba4c…

MALICIOUS

PDF

71.8 KB Created: 2020-12-21 05:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8b5fb828f6ec9eb89e7301fac1a1fb59 SHA-1: e39a473e5dffefbeda5784eba0b479fafeda875b SHA-256: 3c556c3505b3ba4c1fc92a6429b5f6022825314d08abe5f73d387158ea2ad060
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to a known malicious domain. Another critical heuristic identified it as a PDF link farm, with one of the linked PDFs being hosted on Amazon S3. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://ggtraff.ru/strik?utm_term=japanese+translation+writing+symbols In PDF document text
    • https://mebijakonenu.weebly.com/uploads/1/3/4/4/134458360/ed8d1b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fb7ecc4a8e75.pdfIn PDF document text
    • https://jepalojut.weebly.com/uploads/1/3/4/8/134863082/16ed0109c761ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fd308aee4a68.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/wulagisi/brittani_louise_taylor_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/repiritek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f33f2cf09257bd6c4f7e/t/5fc38405a97599144e65298c/1606648839114/23473360156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c010cadf-11a8-4f7f-803a-54ce6099ea09/the_biggest_loser_us_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/sickle_cell_anemia_adalah.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52776e2fce462bca78837/t/5fc88c9e970db930d9c3f0c9/1606978718825/ice_skating_ballerina_dance_challenge_arena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7641bdd-3891-47bf-835d-b2faeebcc39b/good_intentions_ffxiv_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8226d80c-1a80-41d3-9cd3-819b76e2a752/gifirox.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/frankfurt_eating_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227df8cc-98af-458d-9378-6415a02d534a/dadojagemedok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0d15db-31ca-4943-81a7-b9eac36aef4b/1999_porsche_boxster_owners_manual_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72dbf327-76c0-4967-83af-a75fcfb86f7c/famous_blue_raincoat_lyrics_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 3452 bytes
SHA-256: 270be7c6db830c62168f70dd7c23d0205848a1e34261a380894b3d3c52459a8a
font_01_sfnt_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 5464 bytes
SHA-256: 8c853e8ca7d3b724193bee8627d883bf1180d0cbc64982dd4814998601fab140
font_02_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10148 bytes
SHA-256: dfefe81083df0a086631044f210db37d9ef63628b2422ce0b5422f784118af31

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