Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5af9f62a80e87…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 06:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f0e5507070f0854bbbd09406da8d1d04 SHA-1: b7afbfbc58d74ab69cc902d1444485e8ac6d8b39 SHA-256: b1d5af9f62a80e87c8453240190dcc5efd2285aab1795b340f37f8e92d4025ab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to printer setup, directing users to external URLs. The presence of multiple links on disposable hosting further supports a phishing or redirection attempt.

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
  • 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://maypoin.ru/strik?utm_term=hp+laserjet+2055dn+network+setup PDF link annotation
    • https://cdn.sqhk.co/pesuxitum/Vgi9iiC/extreme_bike_stunt_top_bike_race_free_games.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/Gjg8ESE/descargar_lawnchair_2_pro_apk.pdfIn PDF document text
    • http://semasinizitowo.medianewsonline.com/1895885770.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/1jcghha/fruit_cut_ninja_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/hbNeRGV/53654410002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_754a372a99204497ac748fe7b004bccd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/atlas_of_human_anatomy_gilroy.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_6dc0267d1d5c4a7d88872520651b55bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/yamaha_yas_101_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7f753f-4853-442f-938c-0fb50c96a3f0/zomipapeterafuzetivu.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/zeralesufifodifokixupalug.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_20ff55bd14224a81832c2c7aa978e51a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e145ac55-da4f-499f-9086-5215aae5cfb8/old_testament_divorce_and_remarriage.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/the_b_word_in_arabic.pdfIn PDF document text
    • http://nibubatovavav.atwebpages.com/1925_hickman_sea_sled_sedan.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 5544 bytes
SHA-256: fa79f9ec3f8cc251fa9cdfa8dc47ac27e4b298ed3345125387cc063d0319147b
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 10960 bytes
SHA-256: eeddb734b3e0599eeb61600c715f17f1c77cf9a40fab5a0bc6b3196fafd19b10

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