Malicious PDF — malware analysis report

Static analysis result for SHA-256 8872d090bbe08330…

MALICIOUS

PDF

109.1 KB Created: 2021-03-30 13:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: adb89a64140b69a5cd7e60daeae8750c SHA-1: 491b7118a9521e9c881f7a69f52958277ee310ba SHA-256: 8872d090bbe08330b54f856a1ae50c7866abea9e4cd644d794a3e1daf862dfb5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/award?keyword=trastornos+de+ansiedad+social+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408993/normal_60102559afc7f.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/6607558.pdfIn PDF document text
    • https://nipotowolexitav.weebly.com/uploads/1/3/4/6/134639117/5303018.pdfIn PDF document text
    • http://gratoramm.website/war_of_the_worlds_behind_the_1938_radio_show_panicphq2e.pdfIn PDF document text
    • http://verifedform.com/lying_sam_harristkj9z.pdfIn PDF document text
    • http://raftgjgr.space/how_much_money_do_nuclear_physicist_make_a_yearwkcpr.pdfIn PDF document text
    • http://biomaniix.website/cat_in_the_hat_meme_bathroom8rtnb.pdfIn PDF document text
    • http://ladyso.ru/surikiguwixegegifmn17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_605b47a07552b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_6006005f2674d.pdfIn PDF document text
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/wubari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff279d1646fa.pdfIn PDF document text
    • https://jafumatelitu.weebly.com/uploads/1/3/4/8/134884178/036068fdd588b.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/wozowuledij/dnd_5e_fighter_battle_master_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/how_to_replace_primer_bulb_stihl_fs36.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45a5595-e979-4ff2-8de9-ba0ff8e2a2f2/ocarina_of_time_3d_fire_temple_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e862a69f-5f9b-4719-b128-0425063066ba/46187343533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b135beb0-6a65-4e48-9527-d8e85ef422bc/why_is_my_printer_connected_but_not_printing.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/how_do_you_instagram_story_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/2005_dodge_ram_1500_quad_cab_5.7_hemi_specs.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_off00016944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16944 5100 bytes
SHA-256: 58c5bfae7284f6cb9c30bc9c6f91d97eeeb44a179db0bcc9889efe6c99bf4081
font_01_sfnt_off00017aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA6 13248 bytes
SHA-256: 05035264f995e0be5c2d0f966da93c10d0f6f50bd876a501320f7b8de0320cc4

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