Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bc0fab4fc6a4d6…

MALICIOUS

PDF

144.5 KB Created: 2021-03-22 22:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4fe5a2c79d618f9acd79aef606f6cb69 SHA-1: 50f471e2d661c3869aedeb6f054478516526f3b5 SHA-256: e6bc0fab4fc6a4d6d4faa87a04823e294e67faebe8a6d5d718fec71f83b165ee
126 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 URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content through a large number of links. The document body, though heavily obfuscated, suggests a lure related to 'first law of thermodynamics pdf download', aiming to trick users into downloading the malicious file.

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://xezojetit.ru/award?keyword=first+law+of+thermodynamics+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xedogigiloli/Sgjggjb/74511503974.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ifOJidg/10250176714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_6054be747ec33.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/iehahgJ/munadefedekepanot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_601236f214249.pdfIn PDF document text
    • http://kanudivuvim.iblogger.org/paypal_app_for_android_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_5fe68b0c724d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404112/normal_600064422f161.pdfIn PDF document text
    • http://gilogaviteno.iblogger.org/88955991102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/car_wash_fundraiser_flyer_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027512ba-3669-4e44-8b78-6217afdc5006/21105300970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7cb48f-d32d-4b1d-8d37-bbfce3d00e3c/59819827876.pdfIn PDF document text
    • http://mimiwuzoxul.epizy.com/dekekenavesu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/free_proxy_vpn_apk.pdfIn PDF document text
    • http://voworugifajav.epizy.com/xonixapirelama.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/tuberasamenatidajanana.pdfIn PDF document text
    • http://gizapofosiwi.epizy.com/game_dev_story_guide_combinations.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/pafaremogesexilusapozi.pdfIn PDF document text
    • http://mudotepejix.epizy.com/measuring_bacterial_growth.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_off0001f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F43E 5544 bytes
SHA-256: 44a36990f954c2b60d73f8ae01ecb975abae1395edbe36235ea951cdbe88c092
font_01_sfnt_off0002070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2070D 14064 bytes
SHA-256: e0bcff0dbb95a2ba63ec0f62324cbeca77e487226787f896147f4098fcaa4c8e

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