Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4967faff781db12…

MALICIOUS

PDF

66.8 KB Created: 2020-11-18 06:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54861aaf24542619ddf2b8f690b34de5 SHA-1: 1a7337270fb80f0055ae3f92c592434001dd9ab4 SHA-256: b4967faff781db123d6557afc33a40dd18f38e801069d05be9b9ab5ab4eb2158
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a significant number of external links, with one pointing to 'trafficel.ru', suggesting a potential phishing or link farm tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafficel.ru/123?utm_term=2015+fantasy+football+draft+cheat+sheet+2019
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/5025064.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_5fac30ffebe4a.pdf
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fafd8f9a8925.pdf
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5fa442081a331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d0260643-df05-45fe-819d-e9368e41b461/vumefedizirore.pdf
    • https://uploads.strikinglycdn.com/files/74601c7b-6571-4557-9bd4-dc1d0514fd91/38288246716.pdf
    • https://uploads.strikinglycdn.com/files/b4f469da-adb6-4baf-af9d-ea29190f13c6/sopopunime.pdf
    • https://uploads.strikinglycdn.com/files/07fb4bc2-be10-4fb3-9d52-d3f292bfc107/27615305883.pdf
    • https://uploads.strikinglycdn.com/files/385a66b4-2c09-4365-a2d7-187ac0cb4b65/trkiye_nin_siyasi_intihar_yeni_osm.pdf
    • https://uploads.strikinglycdn.com/files/7115cc85-9f94-4cb2-a834-6d341a1b7264/gebiku.pdf
    • https://uploads.strikinglycdn.com/files/e749036e-6123-4b09-98c3-e4e4937b007f/20835792586.pdf
    • https://uploads.strikinglycdn.com/files/a9fad734-08cd-4612-91fa-ca217059f924/12337037284.pdf
    • 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_off0000c5da.bin
35c6d2753a79c14c4a7f3d125b8f8ab57f79b304778677a4042d8e9a1c313c51
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 5864 bytes
font_01_sfnt_off0000d9ce.bin
8bc4c38485a7da40533c7facd07d342a9037532765258058fc4ed6a84cfd8ffd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 10824 bytes