Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b28ea2c22e026d…

MALICIOUS

PDF

86.5 KB Created: 2021-03-29 17:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5426d94d962a7eb72a3519ee7a3addf7 SHA-1: 01b9bd9e6cae80c43b5c9a70a47706058aaa4c0f SHA-256: 34b28ea2c22e026dbe6b5e62c087b511a7aafb7dbc57934bbf02483362dd4cae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicative of a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=equalizer+pro+apk+mod
    • http://zahlungsservice-ch.site/physics_solutions_class_11kyrsp.pdf
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/f0dbe594e25.pdf
    • http://gejesixave.scienceontheweb.net/interior_design_course_melbourne_tafe.pdf
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/a6b7acf2f83876c.pdf
    • http://scotiaenlineape-personas.com/john_deere_l110_42_inch_mower_deck_belt_sizeudvgt.pdf
    • http://55571.ru/38970092825snt96.pdf
    • http://devivitonewe.sportsontheweb.net/dungeons_and_dragons_character_sheet_5e.pdf
    • http://casserlabs.xyz/32383972528fsm2.pdf
    • http://jolixasij.sportsontheweb.net/berserk_art_book.pdf
    • http://lunesygets.xyz/dark_souls_3_low_level_invasions6iz6q.pdf
    • http://mixit.info/882188154688knex.pdf
    • http://fitness1.space/pufufezaluvanunoluzov7iqjd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b1cd5bd0-0270-4c84-bd96-b84cf7854cb6/living_cleansing_balm_tm.pdf
    • https://uploads.strikinglycdn.com/files/3d23262b-2036-441b-ab44-129d6d74e6a1/19444229401.pdf
    • https://uploads.strikinglycdn.com/files/ec5536a8-3bac-4790-a235-a92b53bd8d9d/batuguxabubim.pdf
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_f80f2d5abfd8426989d007ab64590c74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/820bc656-5cb3-41a2-abd4-1a7317794337/67597066146.pdf
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_cd233f373df441c58ef9d4ce13277652.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f078.bin
5d92e285fbdd1818e4fdfc360dc35ff8c585d00a6a38ff336ad48781f0d4e8ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 4820 bytes
font_01_sfnt_off000100d5.bin
14509b20f14889efc2b32a9a19ef59386d22467abb87c04e3b6d0bdcc1df96da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 11752 bytes
font_02_sfnt_off0001291e.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 16144 bytes
font_03_sfnt_off00013e1d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 4324 bytes

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