Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b64f362bf4be22…

MALICIOUS

PDF

74.1 KB Created: 2021-05-25 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 91da76a3dd1a4005ad123a9f87bff6d3 SHA-1: 214faaad7bb6d601b5b6f35069cdcdd6f2d81339 SHA-256: 38b64f362bf4be227e2de84a74cc2e7abc626c23ca4110a5d116e6dafd6df40f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though partially corrupted, contains text related to a 'definitive visual history book PDF free download', which is a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=fotograf%25C3%25ADa+la+historia+visual+definitiva+pdf+gratis PDF link annotation
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/winibewow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5ffece5ce7e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_6013e1ec02ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_605c8ea748efd.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/porazorex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_60405e6e6d167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_601dcc31efddb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5ffc038232c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_601e95fe9947a.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/vofeg.pdfIn PDF document text
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/981f0b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_605f7090de286.pdfIn PDF document text
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/3206065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_6063534ed8572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_60190836b1edd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/guided_imagery_for_pain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a3b81b-92c4-4f28-814c-be90461e2efc/britax_advocate_clicktight_arb_convertible_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a58774-0e45-4420-bcde-8579f1768d67/german_grammar_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/free_cute_blogger_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/yakuza_4_chihiro_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 5372 bytes
SHA-256: 43db5d75f2972016e1e7738f1df1f11d387e7f7425aff1cd9734fe566ed55d34
font_01_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 11708 bytes
SHA-256: 050a65e21e0bda76bd5a6d47fe2317fd83828cd4d6ee27602929a382776ff48a
font_02_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c