Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec86d4a52156d8e6…

MALICIOUS

PDF

98.8 KB Created: 2021-03-15 07:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 141745a58874df6ffdfef2732af416ce SHA-1: 21bcf62dff71a8dd6cfc3ebe25a3f2de61e06200 SHA-256: ec86d4a52156d8e657b813538f27f1591d6125eb083e8d90e4314b88926c61e6
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 large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains text related to search queries, further supporting the lure of directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/123?utm_term=what+is+the+full+form+of+ison PDF link annotation
    • https://cdn.sqhk.co/bemapebe/mzjjcje/38093219959.pdfIn PDF document text
    • http://how2clever.com/1587886064tsfe4.pdfIn PDF document text
    • http://shoplus.info/pasukosatay9ede.pdfIn PDF document text
    • http://vienvozvrat.site/4232882347hgkg8.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/kT52hfu/58510862438.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/e6jhgJy/english_to_thai_language_translator.pdfIn PDF document text
    • http://english-10.site/popjam_app_downloadxh2sm.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/hbjghhu/bloons_td_battles_hack_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedepobe/7aLJihp/animal_shirt_size_guide.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/5f1cfe18-0e02-4400-91d2-aeaaf4989463/how_do_you_unclog_a_fellowes_shredder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b207ed02-a591-47c0-9545-9ac8df4e1ee9/68992762189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f19c59-380d-4113-8ce9-63ce95962347/guvafazavepuwomafi.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2dc7ce299b9d47649f4faf864ab10713.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0c9640-0dd5-452d-9336-d63b08add89d/reading_comprehension_worksheets_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00813afb-8ddb-44fb-a230-226a94f03340/assassins_creed_origins_forsaken_city_treasure_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fd0f77-9189-42fc-8dd6-3a4a7e02507f/how_to_get_imagine_math_answers.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_99bf036d41a94cff8485f84e622b33e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce06ccca-1a95-44f6-be47-f37d6849d9de/fuzobetux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005ba4e2-23d9-428e-bfc9-d8e723079154/asus_rt-ac68u_forgot_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453f2c04-d4b0-4ef2-ad28-390cd6d1516a/salewebaxipuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418f1602-b34f-4dd1-8cc9-67d07a156074/landmarks_in_humanities_4th_edition_free.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_cb74cba625674f87b06e78408587e24e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/424f2f02-a35d-411e-b837-3b27e84b49d1/55907524467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c5a5d1-a2a2-49b1-8d7d-c182acd90b99/used_ps_vita_price_in_pakistan.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_off00014548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14548 5020 bytes
SHA-256: c05e17e7a3fa6e7bed5f10d07bfe10ca43e431fd18c3e4e6bbded2490edfbf2f
font_01_sfnt_off00015638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15638 11748 bytes
SHA-256: 10693622b414953141b59ee68f7733e6080fcc954d66875620d7bc2374bcd4a9