Malicious PDF — malware analysis report

Static analysis result for SHA-256 3759240d0155fe0a…

MALICIOUS

PDF

79.2 KB Created: 2021-06-01 20:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f51bc4228dcd0219add6a8ff33fe6964 SHA-1: 56def773ebec826af42b1d38e3b7091fc74ceb82 SHA-256: 3759240d0155fe0a84d3c24f45b2a7da8482d48174996c7e6d165b18621bb4e0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/pbw?utm_term=how+to+cook+a+spiral+glazed+ham PDF link annotation
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/186016.pdfIn PDF document text
    • https://fudamugifotud.weebly.com/uploads/1/3/5/3/135323440/tipiwebip_kibelubip_totobobefavaroz.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/5a7f6ac8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd2bfb10b496.pdfIn PDF document text
    • https://nulokoset.weebly.com/uploads/1/3/4/4/134447361/pujozenosojaze_lavomupisid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_5fc5a97ec0277.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/zofivowitubosawenek.pdfIn PDF document text
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/3318824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_6069c86d14d66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fcce5537a580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fedfebb4edd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_604767df20aa4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4406809/normal_60b263cb61e61.pdfIn PDF document text
    • https://tudaxuvogune.weebly.com/uploads/1/3/6/0/136082380/9430998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6026b376c88a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78c7770-ea91-4fb6-8089-bce0c8e7a9dc/21163011088.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144450123/new_headway_beginner_4th_edition_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fcd50d-4365-469a-a9fb-9e51bf1e682a/terrorist_attacks_in_the_us_since_2001.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144416427/kifababivi.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_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 5652 bytes
SHA-256: 1ca29c2ff42291201c858a44a3967aeb30818136a249a65387d8e0dd3f12c116
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 10928 bytes
SHA-256: 72470017ea2251975bd9ba02124f63810adab086b6723f8d434e692f1bf6cb7c

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