Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7d6efcb0f06831…

MALICIOUS

PDF

81.6 KB Created: 2021-03-21 00:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 27a30efb3abf888a071f7713526b51d6 SHA-1: a7451fd98b8d424deb1876685d42068c849f7f61 SHA-256: 5d7d6efcb0f06831d2d14e329ba39b9b2577769a29ab8bd5e387d95100936d79
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing lure related to PDF conversion tools. The document body, though heavily obfuscated, suggests a theme of PDF conversion, reinforcing the phishing pretext.

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://seumenha.ru/award?keyword=convertir+un+pdf+en+word+mac+gratuit PDF link annotation
    • http://gijipodotetojo.22web.org/xiaomi_camera_360_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/gg1hhrE/jozazatozeje.pdfIn PDF document text
    • https://cdn.sqhk.co/bitijude/SwuVibB/vudisizunizewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_dc11131db1414d75a94fdd81d98c9a2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/asterisk_voip_android_client.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e769de3-9f58-4d24-97eb-4608e2d1f9eb/20697987254.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/91295164972.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_ae2c19fe3f494f9c8172637516a2609c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a184a2f5-6ce5-45b5-89db-670100b3dabe/best_way_to_learn_arabic_as_an_english_speakers.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2600ed87eaef4e64a23842472a4e453d.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_ee0e1ba65d4d4c5ba73aa3062b034b49.pdf?index=trueIn PDF document text
    • http://wazozoludurisat.epizy.com/79078968996.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_654fbcf0fcb249be969028a637f52ada.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7609cf1-fe2d-423b-b580-b7dc130e74ee/54859932218.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/how_to_start_salesforce_career.pdfIn PDF document text
    • http://vikogen.epizy.com/the_odyssey_book_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f00f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF00F 3584 bytes
SHA-256: eb8450081b66e2b8501efd9a8ecf663a3fd35896eeba8392d70bf0793183e7f7
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 5320 bytes
SHA-256: a61ea743c8dce4bc2faeef2f3fc878f52f8f3ee11e3e85df23e67e1d9c470d4a
font_02_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 12828 bytes
SHA-256: 0bc7aa7854def2295ecddab164f18925c9ef5303dbdb9f35816a8ff70cc32b26

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