Malicious PDF — malware analysis report

Static analysis result for SHA-256 325a2d4414f58af5…

MALICIOUS

PDF

76.1 KB Created: 2021-03-11 14:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 416741773a98cdb713d1e38b3a9b30dd SHA-1: e9cc98ee03ff177f8750b0cc69fbb8201615d728 SHA-256: 325a2d4414f58af581e681b7fe8d774a7838a08b25a7f532af47b80a766235ce
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it acts as a lure to redirect users to potentially malicious content or phishing sites. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=x-ray+circuit+diagram PDF link annotation
    • http://bonifacy.site/where_is_serial_number_on_kenmore_fridgean420.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/gBagcgf/xivepifuxerevurunog.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/jeghjfr/47122521465.pdfIn PDF document text
    • http://fly-drive.online/fit_ball_size_guideoof0z.pdfIn PDF document text
    • http://sacredname.ru/fupomatonogiwugejivnyyqi.pdfIn PDF document text
    • http://bloodcraft.online/zuwafavega8lewt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5fe4c4695ca91.pdfIn PDF document text
    • http://cabinetsly.xyz/free_song_chapak_chapak8bmwi.pdfIn PDF document text
    • http://migerov.xyz/kawijv9l7b.pdfIn PDF document text
    • http://useraisins.pro/is_cfa_marketable_in_kenyacs7np.pdfIn PDF document text
    • http://hook-up.fun/fekewuekah2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_603f47e04a601.pdfIn PDF document text
    • http://tegor.xyz/phonetics_and_phonology_bookc9yta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5ffe25f29c9a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_60025313d2801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_6043702836357.pdfIn PDF document text
    • http://topplafond.xyz/edonkey_kad_server_listumiua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_2d9d41ba5b404d909e71d6263b23c045.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_353c5575be444402a75ad1c995226a66.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_191dcea3a2ba4ba5895ba35aa1d23688.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_30120dc146d744049198a238bf3049ff.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_6ca82c3f042d46868f7d68d275806305.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_83afd33efd6b4a1586a04f0d29b8208e.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_379cb3cb27d24c7aa6d0fffe22c1f9be.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_f9e7cf5109014f92a82297537ff54844.pdf?index=trueIn 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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5160 bytes
SHA-256: 31cc251c43d896ba26f2cad937e64c8f237d1df12231ff26e3c9d53141d2e5a3
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10588 bytes
SHA-256: 1ef4b16dae6d39479c3f58490bc3fa689d49885ea9c9d2cb669a9ba74ae79f30

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