Malicious PDF — malware analysis report

Static analysis result for SHA-256 435bbd02a2d579b6…

MALICIOUS

PDF

106.5 KB Created: 2021-03-16 05:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7076a46252319adae60227ff253ca690 SHA-1: 3b52c0486895dc873779ee747d0abd54cfa5800e SHA-256: 435bbd02a2d579b632624b0d8746c748afc23a21b8488d029f9353e7947dcbd5
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://xajibur.ru/strik?utm_term=connecteurs+logiques+anglais+pdf PDF link annotation
    • http://venira.su/69369349684afhs1.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/giduziruloligeloferim.pdfIn PDF document text
    • https://toromadon.weebly.com/uploads/1/3/4/5/134523466/7791371.pdfIn PDF document text
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/5e3d6df19c7.pdfIn PDF document text
    • http://filanion.online/salesforce_lightning_web_components_cheat_sheetfk7he.pdfIn PDF document text
    • https://fadegoke.weebly.com/uploads/1/3/5/9/135990174/8636002.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/atomic_theory_notes.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/ramai_awas_yojana_form_download.pdfIn PDF document text
    • http://winoorama.space/309451872266ce5r.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/77818939982.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/wiverofefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_92926a44245c4b1290e259af32abc7bd.pdf?index=trueIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_0ba6c0603100433ab2599bb5d8f5e25d.pdf?index=trueIn PDF document text
    • http://degevojorak.myartsonline.com/82842905331.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/wedotosefevagoduviwozu.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_829aa0a6ae394799b91cd1a94bf3db25.pdf?index=trueIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_a89641557e194f14a1f46463bb6a2959.pdf?index=trueIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_3d2c50c31d4849d0b828af20d9e4b3e8.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_8e99c882c9cf47c8b15ee88153e474dc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 3136 bytes
SHA-256: da9227d803687063f66cf7dfa78de1ee905a540eef857ffc4d92688b8418ee34
font_01_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 5352 bytes
SHA-256: 72ad717e54bdb641f2d53e5ed6ca088830f327494991cc41003918a7ae9d2079
font_02_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 10452 bytes
SHA-256: f9bf5d55b2e41fcccc84130969faf35a58eee0952d52204b3d974b6f9e1626c9
font_03_sfnt_off00014db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB3 13108 bytes
SHA-256: b98adced8d520ba079740c02c9f32af377ee677cfdea21aa4f627e38310cbeb9
font_04_sfnt_off0001773e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1773E 17740 bytes
SHA-256: 9682914f0bd1bd7f2852d901903a163c4f1a1173e73d05cd398b3a8f954921c0
font_05_sfnt_off0001917c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1917C 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19