Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ca68613fa85a8e…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 12:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc49610dfb646374597423b08840bc0f SHA-1: 03ac4b614d0d513c76985f5dcc46e7d5f821fa72 SHA-256: 75ca68613fa85a8ea361040b8ec79bfbd5c517162c1396813d8c192a0d9987eb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning to distribute malicious content. The primary URL, https://mezovovuduw.ru/wb?keyword=ejemplos%20de%20dialogos%20formales%20cortos, appears to be a lure. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, as indicated by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://mezovuduw.ru/wb?keyword=ejemplos%20de%20dialogos%20formales%20cortos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fe17f91af25b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474456/normal_5ff7ae7622854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_601f0c7456fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_6032d4b40f802.pdfIn PDF document text
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/zenob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_603f666557006.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/f22d43d9d9dff.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/djgjh5g/33417331577.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/patilawasu/doom_rpg_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/28211541242.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/syntax_tree_in_compiler_design.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/zodonefitaxolexijato.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/zegojawokut.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/molemi.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/how_to_make_a_wordle_on_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/list_of_important_days_in_gujarat.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/zetirewatamonibab.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/free_adobe_flash_player_for_iphone.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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5508 bytes
SHA-256: 2af8c8713cf3e74a586947c3db9bfeba7a367302b19eaa7f60a6613ef7e04fa2
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 11936 bytes
SHA-256: a3bd2ad8c96e1942b63c7a0e5cc537756e7494ba81482df8b01f51d1d5109fc2

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