Malicious PDF — malware analysis report

Static analysis result for SHA-256 824ce3729b89748d…

MALICIOUS

PDF

74.3 KB Created: 2021-03-28 08:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 479d233ce24244f28780ed02359a053a SHA-1: ed030225ee08664c02945aa5ab504c794935cccb SHA-256: 824ce3729b89748dd678ec7d50b17291df984650910cd3a0e107dd67a000a355
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=active+and+passive+voice+pdf+in+gujarati PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5fe7eca162258.pdfIn PDF document text
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/6932689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_6035d686ca57e.pdfIn PDF document text
    • http://laregazobo.22web.org/tagaresusapinelopumofa.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/9135005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_605d6b2b68c95.pdfIn PDF document text
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/newoxubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ff76c93c76b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_6047718f7680a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_6053a422bef28.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/rovimipiwite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_60021f54baf34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6037d9777d496.pdfIn PDF document text
    • https://wanuvimuz.weebly.com/uploads/1/3/4/4/134462356/jiravilulenusod_kedixasenelakaf_xebarejavir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_6027b1109ea0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://kepawomokatuke.myartsonline.com/zofijenonuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af19316-5cca-4445-875c-739ebb6f6995/redimi2_y_christine_dclario_el_nombre_de_jesus_letra.pdfIn PDF document text
    • http://juxalabubifogis.rf.gd/always_with_me_piano_sheet_music.pdfIn PDF document text
    • http://ferobinosu.epizy.com/anencephaly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2890af2-6679-4dcf-9c26-92dbdfe372a4/polaris_280_booster_pump_troubleshooting.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/guxifuweburugirukida.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 5416 bytes
SHA-256: edeb74509903d1f3391984a9035fcc6e249b4a184976c8d2b3a79a4062553360
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 6068 bytes
SHA-256: d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10700 bytes
SHA-256: 77a9ed71ef168caf8554d5c982bbd1f0137d90e72a80782b98a3c9868819bd86