Malicious PDF — malware analysis report

Static analysis result for SHA-256 263960c0cc7d11df…

MALICIOUS

PDF

77.4 KB Created: 2020-11-22 16:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b279d3b4785bcd676769c0014d3d35c7 SHA-1: 1af43ff9f8f43c32016f5341631c886604375b06 SHA-256: 263960c0cc7d11df09c393797187293d6cf020a474f1bf26f4653dc1be330abf
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and contains a significant number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://traffine.ru/123?utm_term=dhgate+customer+reviews'. The presence of a large link farm suggests an attempt to distribute traffic to potentially malicious sites, possibly for 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
  • 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=dhgate+customer+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f97f90b14069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f98510ebc4e1.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/e04cf52d6bc3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5fa5fbd822f63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_5fa082ee86414.pdfIn PDF document text
    • https://kowepesabileb.weebly.com/uploads/1/3/4/6/134635017/5418390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f90ecf6dc8ce.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/vopadofugon/al_anon_meetings_lafayette_la.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25e1913-b9bf-415c-95eb-c5ed5ef30ff7/73661181198.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/wegebesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36dd001-ae9d-4d21-9c69-ec56c3910258/vifibonapibijufozipono.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/28695026821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3e8289-5f24-4737-9fad-02f91e1bbbf5/philips_air_fryer_manual_hd9220.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/android_alarmmanager_notification_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/medians_and_centroids_cw_worksheet_answers.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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 5332 bytes
SHA-256: f945837a7f603608c87ac379e36f3324bd1278577bb6882eaf695978ff73b919
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10668 bytes
SHA-256: 50506a8ac700d94c62f3fe5b40f7f9a96a755107639137850a7f8a57ac8366a1

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