Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d17c81539ede0e4…

MALICIOUS

PDF

89.6 KB Created: 2021-03-17 19:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77a836e860e5d0eed3b11c8e4f920c0c SHA-1: 5a026f58153be91d5bdef3bdfffbc4d3f83a2dfe SHA-256: 4d17c81539ede0e45acd821ea3afcce24f898ce85818eae7411849c53c785507
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a URL with a 'utm_term' parameter implies a phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+use+kitchenaid+mixer+attachments PDF link annotation
    • https://cdn.sqhk.co/lebexuzo/hjLrzjh/guzunexazalozuvane.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/2U2hatm/sam_s_level_maker_apk.pdfIn PDF document text
    • http://ponaleke.iblogger.org/kisosafotodawivuge.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/5249870.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/eZjcheI/facebook_stock_split_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/Jaggqb7/axis_360_camera_default_password.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/hfgdha7/retro_games_emulator_download.pdfIn PDF document text
    • https://solatozelejas.weebly.com/uploads/1/3/4/7/134714892/8949464.pdfIn PDF document text
    • https://cdn.sqhk.co/fudixaxogub/Iu8bhaC/97945023337.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/8486256.pdfIn PDF document text
    • http://maska-respirator.shop/emotions_worksheets_for_adultskfsf2.pdfIn PDF document text
    • http://the-glow.ru/bluffton_university_baseball_field8penp.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/5714601.pdfIn PDF document text
    • http://mmeueue.space/basaxofuvanafokeofg5f.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/higi1BA/biseto.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/nudoget-vawena-mirajizuke-gibolodoliw.pdfIn PDF document text
    • http://lamovingcompany.com/maroon_colour_meaning_in_marathi4qgrg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujapubimeg.epizy.com/remington_chainsaw_chain_keeps_coming_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb56958-e2ec-415a-aca2-385d777cac7d/11110976328.pdfIn PDF document text
    • http://lozezobiwozevop.epizy.com/junifubofadesunexegewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752ea834-b4cf-4b6c-a217-b6b0fe0b866b/ruger_lcp_holster_iwb.pdfIn PDF document text
    • http://bixodog.rf.gd/how_much_does_a_physiologist_make_uk.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_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 5332 bytes
SHA-256: f33fa49dfff234e41d8625c9b38c20b7819829122f36c6bc6ea7e1eef2eceded
font_01_sfnt_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 12464 bytes
SHA-256: 358e6236ef862da6f975b61fc8f6e74835b0435e00b1f24c45986faacdc3d155