Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a7ab28df233ca9…

MALICIOUS

PDF

118.8 KB Created: 2021-05-19 14:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7fe38f2deba0eb3e41276b5b68a43ff1 SHA-1: 214fb050d5ce4b6a02916f0e0350852c5229800f SHA-256: c9a7ab28df233ca9c5aebcbdefcf2e051675b020f121178116918e5920d7ee0b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious or SEO-manipulated content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to harmful sites, aligning with phishing or malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jumiwimov.ru/strik?utm_term=airac+1811+freezer PDF link annotation
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/gepimexubanasopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fce6ebcc927d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_6030383db547f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_606570322452c.pdfIn PDF document text
    • https://jezugazaditok.weebly.com/uploads/1/3/4/6/134601365/pusekaf_semufemasomilib.pdfIn PDF document text
    • https://bekawoxe.weebly.com/uploads/1/3/4/5/134529307/zikegisekirinax_jifodo.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/96416080a8395f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fe872aa1a203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_604bbeb60598b.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/6332824.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/puwexi.pdfIn PDF document text
    • https://guwulazavuwaba.weebly.com/uploads/1/3/2/3/132302871/zivifepiwik_xulurebu_mobisupofa.pdfIn PDF document text
    • https://satepiwe.weebly.com/uploads/1/3/5/3/135350267/6475806.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/javuze.pdfIn PDF document text
    • https://niginijepajenok.weebly.com/uploads/1/3/4/5/134505752/7037965.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/b7208380-5ce1-4309-acef-247ed9cc449e/64424799911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302677a5-6d0c-4497-91c7-d4aa8b7136d4/tajopurepumex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37bcb4a-e0d8-46ce-9eaf-e0bb3fb47a20/petasefajedezotidirera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690c7fe3-6eb3-40f3-93b5-158061fb8a66/fewaxurefefover.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/74500286420.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/64711519917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7177bf06-4f09-43f2-b58e-870bc1472dc1/kinozisanineka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b231c6-bf9c-452d-9f3f-abff487d7771/how_to_set_orbit_irrigation_timer.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17919 1872 bytes
SHA-256: 82f30745d1fb873379318f2d42ec1cec373ed0047a72e384f79ae3fc36ffe934
font_01_sfnt_off0001820d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1820D 4948 bytes
SHA-256: 0f67cd0681748eb6c76ce8a4d395bb6d4096165185ed1a3a9e82968306ea1512
font_02_sfnt_off000192fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192FD 1964 bytes
SHA-256: 409ee9a3885541ffdc58d6bd2d6bfd260a46de59e4270c8c7780dd2af6cdbafe
font_03_sfnt_off00019c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C56 15632 bytes
SHA-256: e98b9fbaea6092e762593bc5078872263b1dbb633ec078f01bd81bbe13efc3a2

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