Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e8da7a18a67718…

MALICIOUS

PDF

95.6 KB Created: 2021-04-04 07:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0155b77a60201f5dcf293ad02c63eb3d SHA-1: 78d3e2a9833540c9c8ecd0e97cbd7ffc1e0e7a3e SHA-256: a8e8da7a18a677189067a27bf1ae0d9cb856ca387c2349daf386587b1b75feb9
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of external URIs and the overall detection score suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=did+odysseus+kill+penelope
    • https://cdn.sqhk.co/tikisudolo/eibMaMU/chocolate_pudding_recipes_easy.pdf
    • http://lezeninimi.medianewsonline.com/edible_mushroom_types.pdf
    • https://cdn-cms.f-static.net/uploads/4450417/normal_6037822f19908.pdf
    • https://cdn.sqhk.co/jokawefezo/ifIiiib/fakigukegawute.pdf
    • https://cdn.sqhk.co/mopomotop/eGYhaMw/worupedo.pdf
    • https://cdn.sqhk.co/xekutenupi/icggidt/dnd_character_sheet_maker_online.pdf
    • http://negedibomul.sportsontheweb.net/64984092383.pdf
    • https://static.s123-cdn-static.com/uploads/4405179/normal_5fe40d9c918a4.pdf
    • https://cdn.sqhk.co/xuwadezab/DCHjjac/dancing_line_mod_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ledufowi.myartsonline.com/96766389291.pdf
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_dac550e8bc024730939d345838497099.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_a7a84a46a0344dda99a846786e995101.pdf?index=true
    • http://gemawinikifiv.myartsonline.com/freud_sexuality_and_the_psychology_of_love.pdf
    • http://povuputuk.epizy.com/assassin_creed_identity_free_apk_obb.pdf
    • http://makakanow.onlinewebshop.net/celik_wang.pdf
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_887f82bdf02642719b12c6acc5560639.pdf?index=true
    • http://vidugozu.atwebpages.com/pit_bike_140_race_engine.pdf
    • http://zazufazujinuzo.rf.gd/campaign_plan_sample.pdf
    • http://pekiluji.atwebpages.com/muputumesem.pdf
    • http://belaletekig.rf.gd/cerambycidae_of_the_world_biology_and_pest_management.pdf
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_b0745f4d5afc4c0fa6905b9caec02469.pdf?index=true
    • http://tositasi.epizy.com/18819115446.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_off00012a7a.bin
43c285832f5506a43ee7176a889cee84aad97d36a3a8a5078d5068390d4b9b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 4616 bytes
font_01_sfnt_off00013a40.bin
d57d4648867388fadc15bf9bdba83747dc7dff4dc6032c902b25da7fd0a9ed9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A40 12372 bytes
font_02_sfnt_off0001625d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1625D 4324 bytes

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