Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d773a397d6d2b67…

MALICIOUS

PDF

73.5 KB Created: 2020-12-10 10:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2e369245a0443e2225c6d9cf9060912e SHA-1: 16d81d91d465c7399b564647986f534c31fb9ae7 SHA-256: 7d773a397d6d2b6711076a13e385539ff5822e5c6d310f9acb4d29767355960d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external links, with one prominent URL being https://traffnew.ru/strik. While the document body is heavily obfuscated, the presence of external links and the ClamAV detection strongly suggest a malicious intent, likely related to phishing or malware delivery.

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
  • 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://traffnew.ru/strik?utm_term=site+planning+and+design+for+the+elderly PDF link annotation
    • https://sizuxemonip.weebly.com/uploads/1/3/4/3/134315948/pulitedu.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/52ede5adc44ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f890af216a2c.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/c52f5104.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/4826195.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/6f3eedd8-bfa3-4034-9534-b6a7d58b01e0/3456256097.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdff27bc819f1cf49ee2b1/1606287143765/kasuviboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a9f371-4780-4d49-8aa5-defd83b3e1ca/25422455590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b828c5e-9878-4df9-a161-93b00745f8af/25108067991.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc174e7bf71053ccb141a2b/t/5fd01fc151357b44bb857df2/1607475146380/mobafikobeju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10aaaf9866f3fd2d521c0/t/5fc2f1e73c02f22b9d6e7258/1606611434041/58233921124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af264aba-34c8-40de-9e42-7723c092b4aa/19434618319.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a18fea4a794d564a4325/t/5fc33344fa04221c7188448e/1606628165397/instrumentos_de_investigacion_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce99e143-7673-4e62-986c-79334565419f/present_simple_and_present_continuous_exercises_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45c38c8-6dce-4ee0-8aea-3b9daee4b3f9/jimiralixoduwojuxasamimo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe2417e7202640eab110/t/5fc4d558fa04221c71b7a7ff/1606735197461/25547776626.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_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 5508 bytes
SHA-256: ac07b62896673cf15e57c81821b5dc5ed30f2616f4098762a540fd61606b2c0a
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 10388 bytes
SHA-256: 90870653033e8a157e6d3acd83a7578074a13eba5e931f265f5f2aac4f2e9a1c

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