Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc271f606ae3e396…

MALICIOUS

PDF

68.8 KB Created: 2020-11-25 07:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 57d7b061957bb303e16790720c4cbbe7 SHA-1: e3f9e6b0b247ff865eb63797fc7899df95af9f04 SHA-256: cc271f606ae3e3968671de58df7b60fbc23d6ff5e377ea9872a8dd8abef87c94
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to external resources, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic suggests a lure to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?utm_term=english+mark+darts+manual In PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/f414d.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/46a214ee54d57.pdfIn PDF document text
    • https://foduzivanikatik.weebly.com/uploads/1/3/4/4/134492938/9341309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fa8e979eaa7c.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/kixolivuvufego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f8db37068b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f899797b2366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5fa3433427560.pdfIn PDF document text
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/18328cfcd36.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/lejivugeleguwod/38666462031.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/24152603757.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/functional_communication_checklist_autism.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/geometry_proofs_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC035 4916 bytes
SHA-256: 1597678e31f9f63b902f127a114e16966917ea188a2a54ea7734f90a51cb5a4a
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 11212 bytes
SHA-256: ee12702251c0a8a25094bc2f170bc7cd5f7b337615e6d496871bfbe86e77369a
font_02_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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