Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f8ba9a85007de9…

MALICIOUS

PDF

76.1 KB Created: 2021-04-09 00:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a591fa8e49f70d21f411b77e22b3539a SHA-1: 5b82ee91fe3bc6cdc12f1d8e93abce32121b013c SHA-256: 79f8ba9a85007de972674b5a981d669908cdb55ae40a7514706661777f83385e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which are to disposable hosting and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dyson+v8+absolute+cordless+vacuum+cleaner+best+price In PDF document text
    • http://bexemusu.mypressonline.com/articulation_skills.pdfIn PDF document text
    • http://requiredjokblog.com/minecraft_astral_sorcery_constellations8fyia.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/jujowudumuj-tudogamijivaper-xivamerezotup-zorajowiluniri.pdfIn PDF document text
    • http://comp-arenda.site/not_that_kind_of_girl_movie45jo7.pdfIn PDF document text
    • http://atlas-copco.su/lexus_es300h_hybrid_specificationscegbi.pdfIn PDF document text
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/7688441.pdfIn PDF document text
    • https://bozajeja.weebly.com/uploads/1/3/6/0/136082115/3a0db9c2f5.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/bangkok_city_map_download.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/5805b851-d30a-427b-8338-478ee4e92625/straight_talk_phone_hotspot_not_working_2019.pdfIn PDF document text
    • https://fcef513a-4692-48cf-ab01-3d1382c723c9.filesusr.com/ugd/c8683e_565dc75530b04f8cb800b669fe9f2100.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_3d6e59a34861451db778023fa52bee29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5fe709-92ae-4195-a4ec-1ad988fc2f3c/starcraft_vinyl_walmart.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/bunozaxowojenezozinenagix.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/vans_checkerboard_slip-_on_platform_trainers.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/mubazote.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5617db648259436d87289d0e0fb3de4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/40366824643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c5b86d-2364-46ef-87ad-96a37fe39895/gorilla_my_love_theme.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_981f9a61db80419f8b3d12ffdcecc6ff.pdf?index=trueIn 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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5716 bytes
SHA-256: 5a3a4a99853f2ebec00dd0c26f61a0498ebc2c61b098566264451ad02146ee0e
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 11284 bytes
SHA-256: 2509d779aa3e48cf4fde196dbb2acd6e0fedce257efcb910b05af23fe1ae8569