Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5b9ef7464b6653…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 09:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45baaee433512a9208d30ca3e19e6652 SHA-1: d7c24ed5feb0f731427c4b8b631b7423c496bff5 SHA-256: 3a5b9ef7464b6653354689f12585160178d6cecb78ae148876b3cfaf50a85158
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=bank+clerk+exam+books+free+download+pdf
    • http://rozogididibusar.sportsontheweb.net/44261727580.pdf
    • http://foodguideblog.com/motupugenirawupuguhmede.pdf
    • http://lamejix.scienceontheweb.net/juloxemaniregabonewon.pdf
    • https://static.s123-cdn-static.com/uploads/4453741/normal_6001ea768df78.pdf
    • https://cdn-cms.f-static.net/uploads/4386848/normal_603ee0e7bad91.pdf
    • http://bazis-rostov.com/44323592792tvthb.pdf
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fc8c4ddd962b.pdf
    • https://static.s123-cdn-static.com/uploads/4393785/normal_5fed6733077ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fadupazageraf/balloon_tower_defense_battles_mod_apk.pdf
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_bdd4c1ea8ff048ac90d210a7b84a64a3.pdf?index=true
    • http://vobozezojip.onlinewebshop.net/how_to_set_time_on_casio_g_shock_ga-100b.pdf
    • https://s3.amazonaws.com/kimone/nate_the_great_activities.pdf
    • https://s3.amazonaws.com/zoxewudunigus/silotigenebukuzo.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_f20393c8104b46c58aefde0308ae4195.pdf?index=true
    • https://s3.amazonaws.com/topipovikapari/neumonia_aspirativa_en_nios.pdf
    • https://s3.amazonaws.com/vabedafozo/lubexovaxos.pdf
    • https://s3.amazonaws.com/nefomojuwet/22452193979.pdf
    • https://s3.amazonaws.com/dovulavavo/diary_of_a_wimpy_kid_the_meltdown_epub_free.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_27aa0b7163f041b5b25337f99b35e081.pdf?index=true
    • https://s3.amazonaws.com/zesotat/94386043873.pdf
    • http://juwukopegonamu.onlinewebshop.net/vedekuvipimema.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e281.bin
131ec379b78180f6753cbaeca037c3f0e83b1fb8d6d4e32e916f208775ba9a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 5372 bytes
font_01_sfnt_off0000f4b3.bin
9caa9db8664ad7351b5c372f1aaa103ec57c6127b05410e8dbf999bfec22cf7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 11420 bytes
font_02_sfnt_off00011b7c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 4324 bytes

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