Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ea6e7f80b7fcf7…

MALICIOUS

PDF

71.7 KB Created: 2021-01-17 19:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324cee356278a9a874b8571baedf994b SHA-1: e8d5bd484d644caa094405633ce7d95e30a78189 SHA-256: d4ea6e7f80b7fcf7f19b50fb116b79c9362974795be2c4ea37c71ee896fa3104
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. This indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=dr.fone+apk+download
    • https://site-1173205.mozfiles.com/files/1173205/vusuvijuzinereximak.pdf
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5fc5a2115060d.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/9259492.pdf
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fc87a329fb99.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f892bb3c7271.pdf
    • https://site-1250005.mozfiles.com/files/1250005/arlington_national_cemetery_guided_walking_tour.pdf
    • https://cdn.sqhk.co/joxutedunik/oihiggh/create_your_first_wiki_page.pdf
    • https://cdn.sqhk.co/sileluzorupo/uzpzyia/barumikegavuxenigat.pdf
    • https://cdn-cms.f-static.net/uploads/4466376/normal_5fd8187325b86.pdf
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5ff0602476e02.pdf
    • https://site-1177224.mozfiles.com/files/1177224/67775757736.pdf
    • https://cdn.sqhk.co/komilede/biihdd5/88917482292.pdf
    • https://site-1168179.mozfiles.com/files/1168179/96910459592.pdf
    • https://cdn.sqhk.co/vijasezadida/PLl9Dgj/93860470043.pdf
    • https://site-1199436.mozfiles.com/files/1199436/55788409230.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d546.bin
36f4028ca9e3cea073f5f3c2846aece9d47a653c9e7ab20aac92a65c537c45ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 5044 bytes
font_01_sfnt_off0000e6a3.bin
5f59717fca121bd3dae5bf19dbaf978e8bbaaf89ec013624277967f5598f5241
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 14132 bytes