Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ffc56f87bdc6f…

MALICIOUS

PDF

75.4 KB Created: 2021-03-30 14:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a21e271d4c9e3415464916a2fed9f524 SHA-1: 0b1fbf09d38beae5df859f0a15f23b961ce4cdb8 SHA-256: c56ffc56f87bdc6fdf5381abfe32c06260d0898f4b7e840954bc52e920340454
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'The republic of tea pomegranate green tea' and 'wkhtmltopdf', which appear to be lures to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=the+republic+of+tea+pomegranate+green+tea PDF link annotation
    • http://ashotik.space/i_ll_fly_away_chords37p6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6045056c71603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5ff90ee1a3310.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/gTsYgiK/23605718264.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/Xig57kb/91924542427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_602423b3ccb24.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/iaJOgic/tippy_tippy_toe_through_my_garden.pdfIn PDF document text
    • https://cdn.sqhk.co/tazurusubiz/Xicigry/fold_up_kayak_wheels.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/what_is_the_school_management_committee.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/cZgjjfU/46131886378.pdfIn PDF document text
    • http://stankovit.ru/how_to_get_a_free_immigration_lawyer5esud.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gghiaia/30143562000.pdfIn PDF document text
    • http://hempmap.ru/1098074056137hiv.pdfIn PDF document text
    • http://amsidgi.xyz/76152931839bnza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_604dc7d86409d.pdfIn PDF document text
    • http://copytoshka.ru/goxoxefosonetitomatewunopbspic.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/AjaGjgg/jasimazidimowasijezure.pdfIn PDF document text
    • http://mixit.info/does_brown_rice_have_fewer_caloriesl720s.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/JZfpjiy/boogeyman_wwe_theme_song.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/safotaxoneroxarag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_6027c364b1e92.pdfIn PDF document text
    • http://ctuxuu.com/baseball_pitching_gripsn1yul.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/fZjfVjd/4415455176.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijarigu.onlinewebshop.net/gurerujul.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 5340 bytes
SHA-256: 1e6569065aeab63fa03a4035316ebe0587bc326822eeb576aeaa245d0ba12253
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 10568 bytes
SHA-256: 5c1cb24a3393f4f61aa0b532a72d3c2c2714629909ef1b4a3609a70a895393f1

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