Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5d67fd365913b3…

MALICIOUS

PDF

75.0 KB Created: 2021-01-02 01:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6f2747711d4d8b1e480d3cfe7f05fb42 SHA-1: ee3b1671995eb0c118524186f81f76cd09972349 SHA-256: 5b5d67fd365913b3a10e894062bbe50407d5f2df3bf81fa5efb10a7346bdef30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier, indicating a phishing or malicious link farm attempt. The document body contains text related to 'Oregon state song writer' which is likely a lure to drive traffic to the numerous external URLs embedded within the PDF. The presence of a large number of external links suggests a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=oregon+state+song+writer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5fea4540b41d3.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/5101609.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/c28393.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/3684003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fa529d44c1f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f437a8b1-7452-42db-a1c1-b55c3742f2c0/fibazolar.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/bemamunivixisofe.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/sociologia_urbana_manuel_castells.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b96cb9-e1f0-40c0-bdbb-77c61a76534d/30529858934.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/nc_food_establishment_inspection_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4b3d87-83b1-4578-9e40-1f527fb378d4/spy_school_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a020b0af-7b40-4ff6-a102-4477ada6dca4/the_meaning_of_marriage_tim_keller.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/86080811628.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
font_00_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 4728 bytes
SHA-256: a6aba51f1a62df6d55dbc1dce07bf4971e440030166baf801b24a781cb90ff69
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 11016 bytes
SHA-256: 58435bbfa56263a6be564fbd9729c0345476bb3b84b46b8349629fe03b95c0e0
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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