Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd9c9fcc5b0ec4b…

MALICIOUS

PDF

76.0 KB Created: 2021-04-11 01:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f585c6ed352d85ec4453c8246b65acf3 SHA-1: 221772dc372f6683dac8c06f883d73e35809ea40 SHA-256: bfd9c9fcc5b0ec4b74d2af6d301bc9f7d81859a92081d0cf78f50460817d491b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and known redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves luring users to click on these links, potentially leading to further exploitation or malware download.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+the+best+boy+names In PDF document text
    • http://parkingtest.xyz/the_monkey_app_download_ioss7e03.pdfIn PDF document text
    • https://turidebi.weebly.com/uploads/1/3/4/4/134496150/8975859.pdfIn PDF document text
    • http://peuer.xyz/barito_pacific_annual_report3dxgp.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/bieBgh6/navy_field_game_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5ffdf4841439f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_604efe01b899c.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/wutilunimeten.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/mupaxide.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/giFjdKe/dark_souls_2_lucatiel_quest_guide.pdfIn PDF document text
    • http://totalcreditreport.info/what_was_the_major_characteristic_of_the_renaissance_in_europe36hbu.pdfIn PDF document text
    • https://cdn.sqhk.co/visipapafef/p9ROSqF/disulfide_bond_formation_in_proteins.pdfIn PDF document text
    • https://cdn.sqhk.co/sinewuvemomi/acWghjh/20985539350.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/3e2b8d4d8.pdfIn PDF document text
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/neliluwadofaxobom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_da3a8f056b384abdb754ac7c32aae852.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_dd546b0726ee479c9498afa093128311.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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5052 bytes
SHA-256: f733b75f9ce0b36adca61ade86e76e718edda3104562f6408eb4dc4c29e48f61
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 10524 bytes
SHA-256: a9d04f96047010f18a6e3d1f425fb4f8f00a3e69301c851be766534331bd0548

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