Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71040b24e177557…

MALICIOUS

PDF

69.1 KB Created: 2021-04-04 03:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e4b25c912fc27668fb43097c49e16fe4 SHA-1: 08775fb1aa3f4e97ae6dcafe6a4d52c619752275 SHA-256: d71040b24e177557a33908b86b81bb96a755c3244033591ee73f530bee0fcc94
184 Risk Score

Malware Insights

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

The sample is a PDF document containing numerous embedded links, many of which point to suspicious or unknown domains. Heuristics indicate these links are part of a link farm designed to redirect users, with one specific URL identified as a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://yafferge.ru/strik?utm_term=hoover+windtunnel+vacuum+tools In PDF document text
    • http://toppiksnack.xyz/lepukatenejulufiximajimuxlxjb.pdfIn PDF document text
    • http://outputqwvk.space/88193301021rc29i.pdfIn PDF document text
    • http://0fruits.space/nemilinenubaporogevuwk41j.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jX2psFs/wilinipizonugimex.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/icigOnE/sededujenodowegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_602e1d645cd87.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/xiagfjg/alien_shooter_2_the_legend_cheats.pdfIn PDF document text
    • http://pet-guru.shop/69781897298r49sr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_6003f3141c894.pdfIn PDF document text
    • http://raisinshub.club/fagezibasukasuxotito2dujp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_605c17dea3d8e.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/Qgd2cgh/87766905448.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/bjhhbjj/jiniwujosigidibosixar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c0fbfa-d2ad-4445-86c6-43112a26d21c/how_many_questions_are_on_the_cdl_permit_test_in_ms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2116ce2a-c4ae-4251-a21a-8cd0bb0f66a4/38249441724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3ecebe-5f5e-4ff5-aa11-68f48b3433a3/5569473292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647db2b7-07e9-41a6-815d-e20f102facdc/diary_of_a_wimpy_kid_the_ugly_truth_movie_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e130b0-3f6a-454e-a0c2-d74217f15918/un_curso_de_milagros_leccion_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e64e46f-9b02-4b7a-9775-da0ac3f9b80e/39832911626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cee907-55cf-44fd-b9fd-c96c2f115fce/570671594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190394f1-48aa-4206-b42e-f47932ed46a2/how_many_calories_in_taco_bell_crunchy_beef_taco.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_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 5196 bytes
SHA-256: 9fbcb703f0e5162183b48dc0d2a34a9dcb6ec211e28e5217cb9c86dce5632b14
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 11132 bytes
SHA-256: f874460836f34a1857429cb8148c5b06833ff9f9baeb55c59dd0e1b18b885cda

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