Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5f92071d4a1418…

MALICIOUS

PDF

72.1 KB Created: 2020-11-21 22:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 298ee6e8fdff9a8684d2e941c81323e6 SHA-1: bdbfbffa8b8b11efec71488727e3c7b48ec4551e SHA-256: fa5f92071d4a1418e51862d7d5b0be307593758a916a6e9368363f16053fcb44
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document body contains a seemingly innocuous query ('How many fluid ounces in 50 ml') alongside metadata from wkhtmltopdf, suggesting a lure. The presence of numerous external URIs, including one pointing to 'trafficel.ru', indicates an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=how+many+fluid+ounces+in+50+ml PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/sotepavuj.pdfIn PDF document text
    • https://sipimivib.weebly.com/uploads/1/3/4/6/134657766/sefataw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f90c92120812.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/5013301.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/3963931.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/83516739-44a3-4b61-845b-676b2ee44320/parrot_jumping_sumo_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f861f27-e53e-480f-acd6-7f536a1f61e9/rangers_apprentice_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/guidestone_church_buena_park_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc452f29-bf57-4376-8955-abfbfc0c532a/rutojixojukuzerutike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8e425c-10f2-49fc-bad9-7c642d4ef08d/jerabiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da372c0-f033-4c67-8294-5fdd113523fe/46273156316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebad568-0af6-4f57-94d1-553b7c92f32c/40404384680.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/71226396712.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 5492 bytes
SHA-256: 20755eea5239da0a6db1d9713b05a07fe32f9f50b64e6ce820815e3317bd11ea
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 11984 bytes
SHA-256: 44f23d806ccd5a2a33368541b7140051b6a8490d11ab726f70990f3fa69a1fce
font_02_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16216 bytes
SHA-256: 9aaf374d64521945a2d179b3de22a0ad451813c1e8d23897d9514ef9876b453b

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