Malicious PDF — malware analysis report

Static analysis result for SHA-256 871175a50e6bef15…

MALICIOUS

PDF

80.3 KB Created: 2020-12-21 22:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f994353abee88d0d37ef74a2471a8997 SHA-1: 997271fc3efb171fbab5b5c535aef08c434fff33 SHA-256: 871175a50e6bef15dce2452153d6e7b6d3df9e159468ba47ac9249523597323e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and the presence of UTM parameters in the primary URL indicate an attempt to drive traffic to external sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/strik?utm_term=boy+skins+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fd87a84810ec.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/998533.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/depopetuvubimudej.pdfIn PDF document text
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/genavali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fdec8b636cf5.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/3207316.pdfIn PDF document text
    • https://pufibifisap.weebly.com/uploads/1/3/4/4/134450659/9256477.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://s3.amazonaws.com/xupizewuxere/zijasaxij.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/lomeloxipuvipedusog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e6503a-90e2-4d4b-a756-4e79845c67fd/57717863615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c48cae2-168f-48b8-a67f-cf7276271cb0/les_miserables_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/gymnopedie_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d584d32-fe30-471a-b8bb-37768dce4cb6/83531560363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f22a105-e5b4-4dfe-a4cd-e1d611421d8f/sovupi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 4620 bytes
SHA-256: e507aa75c97bf5048252051362036dc905ac329a9bda6c4dc09576acf09485d8
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 10400 bytes
SHA-256: de8e28e0df038d7aaa313f96e637c2132a709f186d59a9889a71e3f41d268667
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378