Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3107b20f5a5f90e…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 13:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 01bf3606a8434cc8b74efb45ea08dad4 SHA-1: 29d675e3826f8190f8c64cd2c3f966f2b2a3f262 SHA-256: f3107b20f5a5f90ed89f6c0de70bc96f7a30756f9436d748f1d31fdb68f2b1db
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=asfa+guidelines+pdf PDF link annotation
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/652d24cb8.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/X5geS6V/overdrive_premium_hack_mod_apk.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/2532b24.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/uibhddK/14016762953.pdfIn PDF document text
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/b07e3dd9.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/hg6vhc1/talunej.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/cVujhgg/61794015084.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/Tjhjijj/degotiba.pdfIn PDF document text
    • http://dithetsen.xyz/streets_of_rage_2_soundtrack_reviewttnfn.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/ljggdiN/call_of_mini_zombies_hack_apk_2020.pdfIn PDF document text
    • http://igonlinesupport.com/emperor_clock_company_model_101te1av.pdfIn PDF document text
    • http://pankreatitum.ru/what_do_you_need_to_earn_money_on_tiktok9ayie.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/teloze-tirixokibumuto.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/78a599ca4.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/ji0jh0x/renegade_racing_crazy_games.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/9e18eaec-6610-4029-bf35-b75459c39456/31262546042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad52bd70-fce3-4231-89f9-d9a8a1b8f85c/15278081570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f1b20b-73fa-4699-8f67-2d4b2728d4fa/51761837750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665faab9-6dd7-4821-9b43-0bcd3fa303a9/remington_model_11_sportsman_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45130209-7eb1-46f3-9bbf-d38aff442af3/one_touch_ultra_control_solution_rite_aid.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 5100 bytes
SHA-256: 54971ed3fb015c78ceb73de3f646b1975e61ee7ca0089cc824257d3c8f72bdcd
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 10736 bytes
SHA-256: 80c86723fbafe5b3c21b041ebbdcac0f2370cd2c3b5839aa1f9166b520788f10
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d