Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b1f6e16f6cf6f…

MALICIOUS

PDF

86.1 KB Created: 2021-05-28 21:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d687a52ca709e7e19341f04b8f368918 SHA-1: 237de79ed3610de78105e52b6b0937f17672f813 SHA-256: 651b1f6e16f6cf6ff95c56db13327cd571c19ee14d5d41a448dbd312adb41f2b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier flagging suggest malicious intent, likely to distribute further malware or phishing content through these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=ennavale+adi+ennavale+mp3+free+download PDF link annotation
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/zasebivaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5fe112d58eb20.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/b2b28e54efa3a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412887/normal_5fcff4fd6b990.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/1057049.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/7a7103b398f0cc.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/6307389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_603d28f185f90.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/xenexefaxuge.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/6294940.pdfIn PDF document text
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/351379.pdfIn PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/0846516.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/vibatawukitas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fc6f084720a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_605d7c4f8e4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_604646147a0b9.pdfIn PDF document text
    • https://gavivexov.weebly.com/uploads/1/3/4/6/134667590/4991295.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/c4a283d0-af69-481a-a8e0-17d1b1a14c68/introduction_letter_of_a_construction_company_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419604fe-9800-488c-8dce-7bfae1a52e54/zelekifuwokadelowigoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80016a63-67ff-489c-8147-4fa90bae18c4/what_are_3_powers_or_roles_of_the_president.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f950.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF950 21396 bytes
SHA-256: dd19bd5c0b82e11e04b8ae734a28e04baa8500bc5a9df694c9d5419d6dc6bfd6
font_00_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5284 bytes
SHA-256: f04573c08c4dd71faa4e4c4128ac88e10d1cea1fb77882841d8f83a94c1aabc4
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 10432 bytes
SHA-256: b972776a66aa2ae1ae4974b892ae749ccaef76147b47f86ff6c293408bf9bac7