Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd594ca3a4c6d46…

MALICIOUS

PDF

98.0 KB Created: 2021-03-16 15:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8b836e5b52bca5fe983ea51da5b94a88 SHA-1: b968c95da1341e597a0d3df50369ee7b68a08f03 SHA-256: 8dd594ca3a4c6d4662156b4d4fed826243c2379c8d0030090c72212bcc594c95
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external URLs. The document body, though heavily obfuscated, contains references to 'Android 9 features' which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/123?utm_term=android+9+features PDF link annotation
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/7b02569af.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/idiihjb/40103609373.pdfIn PDF document text
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/lokabuxepu-jizusibufagu-jakoxi-texesodiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/b7KhiWq/armour_beast_arcade_fighting_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/zpIjeid/city_car_driving_simulator_download_free_mac.pdfIn PDF document text
    • https://nozitobolilijaz.weebly.com/uploads/1/3/4/4/134473425/86503.pdfIn PDF document text
    • https://budogifu.weebly.com/uploads/1/3/0/8/130874026/9b60f2c8e7d9.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/bovadubix.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/047eddfde1189.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/13c28dcfed0a.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/WLuXH1Q/lep_s_world_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/46Mvagg/red_ball_4_unblocked_volume_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/wire_gauge_thickness_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/nalulita.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_39039f238a3a40b0806bdb371ac4dd0e.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_97cfbfd7c1a543ac969904ec818a5683.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/chick_fil_a_job_interview_questions_and_answers.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_56f547a1725d4937a0244ff47d20b291.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vanatul/samsung_galaxy_play_store_app.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_6eaf3f46df5948e498e1a261d55a4882.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 5016 bytes
SHA-256: 84709d1f54f428ff90ec78744a003d0b70778a949c1776a403f0baaa2034ff5b
font_01_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 11312 bytes
SHA-256: 842c1fdf7d576d052804b506afa79af7ccd8a3bd97847cea342e9b11486ad5cf
font_02_sfnt_off00016714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16714 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7