Malicious PDF — malware analysis report

Static analysis result for SHA-256 915d2c924ce05ac0…

MALICIOUS

PDF

85.5 KB Created: 2021-03-12 09:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ce0ac01c953196e417f33fcce5e160fa SHA-1: b100b26cc5b75e7b2ac2c1bcc18a9c2a611aaeac SHA-256: 915d2c924ce05ac06886d2a0ccbf0c6ad56a499fc374a0d8842fb24d59305ea6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain associated with keyword-based redirection. Heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nipisod.ru/wix?keyword=wreck+this+journal+%25D9%2583%25D8%25AA%25D8%25A7%25D8%25A8+pdf PDF link annotation
    • http://sportplays.ru/bijuzegawinefidozme1pi.pdfIn PDF document text
    • http://airned.ru/sentencing_guidelines_uk_20184sk7k.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/jibvgiD/xubojojezazujosi.pdfIn PDF document text
    • http://artemk.ru/past_simple_irregular_verbs_exercises_eslhp8yn.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/how_to_answer_text_dependent_questions.pdfIn PDF document text
    • http://nikecortez.net/what_is_social_constructivism_in_education9kr4k.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/9rjgjbI/kefuzesir.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/cgp_a_level_physics.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/jesubakisewuzedur.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/sjaibgd/filter_sort_in_r.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/jije8gh/81118756599.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/hbtggjb/keritezegogeketatokim.pdfIn PDF document text
    • http://libertinemodels.com/law_of_sines_practice_problems_with_answersdn2ns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_f600f6c75c8b4b85b4ffd2da31c076e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fadf47c-4ac0-423e-8eaa-5e1e2b88f1e2/america_the_story_of_us_episode_12_millennium.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/hack_app_data_free_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/59462789564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4173ea9-70bd-4c24-8521-c31e1a2b70df/gigulovasoj.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_467f2d423c0542c8892ab7d13e1b5444.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a5eb56-096f-44c3-a2b7-6db235e5899a/75196902104.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_8f998558963e4a5e82678430ea7712f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b9c97d-6d66-47a4-9ab0-852605aec609/91272258857.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/manual_de_auditoria_ambiental_la_rovere.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_3d0996155e924135b4212c43949f0b92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/18674087859.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 5396 bytes
SHA-256: 5f767d18490efab59815e53e27c7823ea0ae27a047b6718ae65f952283132afb
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 10240 bytes
SHA-256: 99098dd48b11f077b9f02278338a010e4ad0684a29e15caf75220fc3c6dad748
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16468 bytes
SHA-256: 5f0524d653baaaa24e2a9c3f469fecc583e9d399729bf4ee5ea261b5ad4a758a
font_03_sfnt_off00012bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 17540 bytes
SHA-256: aac75722489aaa750bef62bb8041cf19aca8b6bcbb47bec77a29bcce555bee8d

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