Malicious PDF — malware analysis report

Static analysis result for SHA-256 779cdd953966a141…

MALICIOUS

PDF

81.0 KB Created: 2021-03-31 01:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e0dffeb19010d0c0ceb6f531c44142 SHA-1: 6b5588cc1046b4b694be4bc480590785397956c4 SHA-256: 779cdd953966a141fe2eb0e59a2eecbcf59b3f7cd48a32b841efd7c1c3d6cb56
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=how+much+does+a+round+bale+of+silage+weigh
    • http://hidver.com/ms_excel_exercises_for_studentsehlqt.pdf
    • http://uaregroup.com/414105441620u4fx.pdf
    • http://fullpisetc.ru/what_is_in_whirlpool_water_softener_cleaner1kai7.pdf
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6012bbc392e8f.pdf
    • http://onlyforyou.space/voputiwa0m99z.pdf
    • https://cdn-cms.f-static.net/uploads/4388833/normal_603bbd1a145e7.pdf
    • https://cdn-cms.f-static.net/uploads/4473062/normal_6035a8550dc26.pdf
    • http://uorott.com/29895915358arroq.pdf
    • http://wofonefa.iblogger.org/stock_market_holidays_2020_nse.pdf
    • http://wuzotevoxed.22web.org/73940298045.pdf
    • http://ampinternational.org/nursing_dosage_calculation_practice_worksheets_australiaaz43x.pdf
    • http://kpupnov.pro/2331362950823nlz.pdf
    • http://unlockdeals.shop/zinikuxemaxoxil2mfxp.pdf
    • http://rawenspant.online/offline_gps_navigation_app94c9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_0dbb2a4609b94974863482e9762f2900.pdf?index=true
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_07cbdd8d38f74a77a99a9220b39fdebb.pdf?index=true
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_b50cd0b240464ef0a946b9ccf13904b4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75319faf-ab4d-42a8-9bcd-380d0d6a9c61/south_carolina_drivers_permit_renewal.pdf
    • https://uploads.strikinglycdn.com/files/8bfb3662-bcf3-4586-864a-1eb793b1ce17/why_hp_ink_so_expensive.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_a8f3994616854f7082abec0a1abce6d0.pdf?index=true
    • http://vutiwaravoril.rf.gd/can_i_talk_to_a_real_person_at_fedex.pdf
    • https://uploads.strikinglycdn.com/files/1e0413d8-0d99-48da-a3d3-b8a9d4b29cd4/57050869361.pdf
    • https://uploads.strikinglycdn.com/files/9c74aa51-98c1-4da8-892a-02019dd1d5f0/compaq_presario_cq5700f_video_card.pdf
    • https://uploads.strikinglycdn.com/files/8bd4ccfe-6638-424f-9c2d-7d360aa43949/how_to_reset_toner_on_brother_printer_hl-2270dw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fe.bin
824e147d658fedcc6cec37392ef6800715c5e23d14c0051097f60fec5e4eeb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5628 bytes
font_01_sfnt_off0000fb07.bin
0703270eec1c40edc2b107378f1e1645a452df8b311f3a8f263b4dc2cdcb2b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 11192 bytes
font_02_sfnt_off0001218c.bin
3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 16028 bytes

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