Malicious PDF — malware analysis report

Static analysis result for SHA-256 f822cf6ed1327fae…

MALICIOUS

PDF

80.6 KB Created: 2021-03-25 12:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21d4a9a4beb00a6435ddb55d9fbfa466 SHA-1: 233223db7fb1bb50462fe668a067cd2f232a8391 SHA-256: f822cf6ed1327fae736924f56e8e885b1aaea804f3d4b8d4198cd26f239769ee
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with several pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://pelibifir.ru/123?utm_term=art+anatomy+of+animals+pdf
    • http://bumawusuka.mypressonline.com/38280951251.pdf
    • http://najelipopusivut.getenjoyment.net/37118549901.pdf
    • http://dawexefif.getenjoyment.net/causas_de_la_caida_de_tenochtitlan.pdf
    • http://vawadofofasip.getenjoyment.net/greek_gods_in_percy_jackson_movie.pdf
    • http://podeves.xyz/58088716415xnx1.pdf
    • http://instahelpforbusiness.com/what_is_carl_rogers_personality_theorye9ngk.pdf
    • http://jotitojimo.mygamesonline.org/animals_and_their_homes_young_ones_and_sounds.pdf
    • http://sutivetowit.mypressonline.com/classification_of_antiemetic_drugs.pdf
    • http://alex-chekalev.com/on_the_milky_road_full_movie_watch_online3hi3z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_4beff7732ec5418b8ce4b002c23e7789.pdf?index=true
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_506035d8a52f4e04a7fe56468dc0b101.pdf?index=true
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_37906b8b10944b8b9022c97199cab969.pdf?index=true
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_ea11cd7ceea44e94bdf73c1a432a01e0.pdf?index=true
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_45fe7de03d71485eba2760851b22018a.pdf?index=true
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_db84dcc0a50641d8955936d79f13444c.pdf?index=true
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_dc11b0edced3457f94fc1046c7024ebb.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_c5919c37b83f46fbb47b2741a7d9f0db.pdf?index=true
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_e6c70b8dd14a49aab33069d6f5c6dee8.pdf?index=true
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_383a3125e3b4402b945bcb52f2633f10.pdf?index=true
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_b9218dc4a2734c98aaf90eb00532e6a1.pdf?index=true
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_9b2e35ed26d64aada9a633535f0ce5f9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa23.bin
a8117c1f4f679a42f4eeef2b666e5842ebd8dbca64d5ef589a8196ef2500f15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 5276 bytes
font_01_sfnt_off00010c0e.bin
51bfb6c6c4372d211a78af39490f917ad91b5902aa2ec02f4894771aebcf1af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 12256 bytes

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