Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c025e932b1968ce…

MALICIOUS

PDF

81.2 KB Created: 2021-04-07 21:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2b6c0be4d74bea0d2482189e2557d8e7 SHA-1: 206dae79add60bd322b5188150ee0a8dcfe970b5 SHA-256: 5c025e932b1968cec5f0d4a8e85b7693c5bafd015a80d9758a7a3c4559b82073
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+many+grams+of+carbs+are+in+donut+holes In PDF document text
    • http://raicen.com/why_does_my_pressure_washer_pulsatelxxfz.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/fmBhjjj/ticket_to_ride_beatles_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/bgctWhg/47273503268.pdfIn PDF document text
    • http://goldenframecollision.com/adding_decimals_worksheet_tenthst868l.pdfIn PDF document text
    • http://ekbsite.ru/corsair_cx750_atx_power_supply8lw2p.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/II7Kge5/cross_birds_lenormand.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/itCjrhj/marco_s_pizza_nutrition_facts_pizza_bowl.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
    • http://dikitef.epizy.com/povaxajafoneg.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/52468898814.pdfIn PDF document text
    • http://xixesasix.epizy.com/chloroacetyl_chloride_msds.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/carrinho_de_carga_plataforma_aluguel.pdfIn PDF document text
    • http://dawikoduwegoka.rf.gd/samsung_mini_split_parts_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/19321365507.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_3d885ddd90da4065bcdd61549a4e70e0.pdf?index=trueIn PDF document text
    • http://fopugaxug.rf.gd/lord_of_the_flies_while_reading_chapter_10_worksheet_answers.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_23112a63f7ac45e4ad2141f19c08cda6.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5612 bytes
SHA-256: b7430c5d1a6d70c6c16176c4d1289f14bddac7c2af843a0ddf04a1583567f853
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 11412 bytes
SHA-256: 1567d3446c2b04e97ad1eb2ec55c4ec0d0ac39c4ed488e1fe48990e00ed3fff8
font_02_sfnt_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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