Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3455fa67dacd9a3…

MALICIOUS

PDF

77.6 KB Created: 2020-11-13 08:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9461e87dde7a37d7c4b7ec7403aba5a SHA-1: e85785047692f9229b290892a4b70d16e12b3836 SHA-256: b3455fa67dacd9a35ad443b193653fa7cb026f5bbbbc27a97370a4626714fa70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to drive traffic to various websites. The primary URL observed is https://trafffe.ru/123?utm_term=the+outsiders+television+series+2015, which likely serves as a malicious redirector or phishing page.

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://trafffe.ru/123?utm_term=the+outsiders+television+series+2015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8a80650d748.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/6966138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8ae8a370dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f92e2f7ce9ce.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/4306272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f9642575ce6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f8d7b9b3e81f.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/liguwubore/xenezewa.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/64423212483.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/84401808703.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/96439337575.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/gemstones_of_the_world_book.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/zovanober.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_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 5164 bytes
SHA-256: 08323d7239c3b4d7cbc06f974bf0d8778e6c74ddc92e5cd80cc622020cb0bf54
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 11056 bytes
SHA-256: dd78f6b576a6da2e53b387a02cee821e1d2f4bca2a0506864939860df704e1d0

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