Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bd95fd1738492f…

MALICIOUS

PDF

65.8 KB Created: 2020-11-18 07:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b4277379669d20f8fdb91de73f8e552e SHA-1: 1ba6f6f6cda988b7a2b8aed10d529e4809cd8f66 SHA-256: 85bd95fd1738492f0366a280e171b33218f08ca335a4f9c73dd213b112390b42
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • 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.
  • 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://traffine.ru/123?utm_term=golden+west+spring+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5f9a6728ef4ab.pdfIn PDF document text
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/sinemejurupot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f9bebb43a1e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_5fa4bd940a947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fa3483fcc746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_5fa245e6bd677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f8bbd057b37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fa76ec3e7df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fa900ef0d3fe.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/0c4ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5f97cadb3a5ad.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/bezegoluzose/brunnstrom_technique.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/capacitor_bank_design_calculation.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/jesd204b_standard.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/zidedapilena.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/tigo_energy_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/48705327515.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/osha_incident_report.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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 5520 bytes
SHA-256: afa4d5f0897c39e32659507cc17c296367bcde89da64a37f629087e13de63e03
font_01_sfnt_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 10752 bytes
SHA-256: b6050663ac2a30f8743af887c09d5565b5a84dfd50d02b3c0c9f4f7be14be726

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