Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a696ddb079f0301…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 06:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d19627242d96228a8ca2707d3df1976f SHA-1: b0b1deda1d938b6d74b8582be17274cd5c7c07fc SHA-256: 5a696ddb079f0301fdf6ceebbe432b4642917d17e7b26698895f6b1e8a58f08c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV both strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to 'graphic design assignments for college students' and references wkhtmltopdf, likely a lure to direct users to malicious URLs such as https://seumenha.ru/wix?keyword=graphic+design+assignments+for+college+students.

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://seumenha.ru/wix?keyword=graphic+design+assignments+for+college+students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465538/normal_60280861bc13f.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/aWIsjL8/treasure_hunter_games_free_online.pdfIn PDF document text
    • http://zadidibupinumav.22web.org/79608910172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_5ff337944f751.pdfIn PDF document text
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/6716093.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/ifujihb/birthday_cake_table_decoration_ideas.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/purupubaza_gofulujiselin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5fdd3377a603c.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/rCifqgh/64053827505.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/NkSiiHn/okay_gif_cartoon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_602e5c4a12d84.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gupofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417220/normal_5feb46fb43457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_6036b66cf0930.pdfIn 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
    • https://uploads.strikinglycdn.com/files/8d902061-5a12-4123-ab07-ea7bd7e7051d/lajubigujalebolupusabowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f42bd8-3d07-4f2c-be08-f04036115753/crochet_patterns_ebook_free_download.pdfIn PDF document text
    • http://lawubipala.epizy.com/motorola_walkie_talkie_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efff505-707b-436d-a7c2-27f6e4a2bf5c/11794884984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de10e21-67ac-4420-9223-a6c944e7d6af/how_to_teach_yourself_brazilian_jiu_jitsu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ae4167-73f7-4a3b-b4b8-24393d861b3b/the_taming_of_the_shrew_plot_synopsis.pdfIn PDF document text
    • http://gagoxapedako.epizy.com/cooking_and_fishing_leveling_guide_classic_wow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5484 bytes
SHA-256: 99e214fd81346c4f631ec14788e897edb8c84c6208340ecca9ce5757d598d400
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10948 bytes
SHA-256: 6e0b61f8345b4cd75c45c7eeb39c3c107003b5c0728b45516f88176cde9589d3
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361