Malicious PDF — malware analysis report

Static analysis result for SHA-256 674c3216838813e0…

MALICIOUS

PDF

80.5 KB Created: 2021-03-09 16:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 53ff75ec56754865acf44d98b0bce150 SHA-1: 9239a2bf11c0bc7a9fa6dbe5a9dcd11f144ce3a6 SHA-256: 674c3216838813e02a6ea850277828e3cb324949ce0dca246ce96d44f7bf23f6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=lds+general+conference+2020+youtube+live PDF link annotation
    • https://cdn.sqhk.co/dumoniriwo/R5RZAsT/avatar_maker_couple_of_cats.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/c64b6822015da11.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/gEgcfuJ/7753968142.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/f2394104fe6a582.pdfIn PDF document text
    • https://cdn.sqhk.co/tujujelo/gcjfFtL/75534223891.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/hcygiia/push_box_puzzle_game.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/8ac4cdfa084a2.pdfIn PDF document text
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/84ec46d8.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/380623.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/hdHigdy/supplement_superstore_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/f79Hjgp/38638952447.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/vYvjjjd/43985440821.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/Z7PrXVN/76375398360.pdfIn PDF document text
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/8f71b2cd01336.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/iO4giOw/how_much_does_pure_copper_cost_per_ounce.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xelatisil.rf.gd/ludogetexojafisib.pdfIn PDF document text
    • http://migisunutejelu.rf.gd/jump_rope_workout_for_stomach_fat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6858899-88ca-4800-b1c3-dbcc86ea234a/the_way_of_the_shaman_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77187e56-8943-49e4-961f-69b532c64264/kuzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011ab15d-eb39-4551-8f3c-a3e860aa3b9e/41279128511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050342ee-c056-4c77-b961-b3491517f966/53416892614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501fd961-9a05-4f3e-b836-af687e20b186/52014757092.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 2192 bytes
SHA-256: 16ff826bb9ff509738d6d9089a31f020bdb01a885c901a0d33d101898c7f6018
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5588 bytes
SHA-256: 2c8b7e94f7df0c5724ae08b5aca71d5d3944c8b28d41eb57f62a4dc3e0b06177
font_02_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 10392 bytes
SHA-256: aa0951a46f0b4f2a84a69d69b28dd505a5e56834f5722e7a97cace0a13030cb8
font_03_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e