Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e5d33f321d06da…

MALICIOUS

PDF

82.5 KB Created: 2020-12-23 09:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7f8443516acc1da74b446bafdada5057 SHA-1: e97df6a390eac94df290c87c1f4498f1517de7ca SHA-256: 79e5d33f321d06da3b125a7e4c688b1487ae9e6f3dade654fb5d76b1cd0a08a6
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a mass of external links. One of these links, https://traffset.ru/strik?utm_term=tangled+the+series+cassandra+doll, is flagged as suspicious and likely leads to a malicious site. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malware distribution attempt.

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://traffset.ru/strik?utm_term=tangled+the+series+cassandra+doll PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fba7e1bd5c3e.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/gonawerewuperunapipe.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/zapesagili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5f9eeda0373e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_5f9d0e0fbc852.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/0668105d-82d0-4c00-8eee-ff60de4d8cec/negaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a78659b-47a3-4d00-922e-2196d1702555/condos_for_sale_in_bay_harbor_islands_florida.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf597bf3de5e49b55b9bba/1606375805068/kiromilixafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d9d760-2d35-42e5-8dd5-4883725725b3/disney_adventure_guide_salary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc556ca5bcb0228a2a007f0/t/5fca0d4e85627875176118ec/1607077199044/sql_express_connection_timeout_expired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbd4a1b-b4be-48d4-b0de-87e8c2aeff54/ti-_89_calculator_online.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 5152 bytes
SHA-256: 89070d835f97512593dadf0669bd8b87f413ad9b32854a54a50c9e4929bf5436
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 12112 bytes
SHA-256: 7cfb51883ce0938cbdd492c37305e31ebf61623310d4cf5962a813c7db3dc041

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