Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1d074d5c9190a…

MALICIOUS

PDF

76.7 KB Created: 2020-12-29 20:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15574f4531c89221d6b9097603150fc4 SHA-1: d0daea73f9df1eb435fc9ca89b7fdd3de4cbb88d SHA-256: c4d1d074d5c9190a9b0f8fc846797d936970aed779ea20281f7689a1f1b0c500
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a malicious intent to redirect users.

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://ggtraff.ru/123?utm_term=awakened+house+of+night+pdf
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5f95c3325a4c6.pdf
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/juxedavuzimudu_kafukelafilune_kinobojojawo_rarefuzis.pdf
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5fc51e2cee22b.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f9779a2e854e.pdf
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/wegopeva-xajojugozupe.pdf
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f914e3cda49b.pdf
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/8159145.pdf
    • https://cdn.sqhk.co/kezixowog/dnjb2OL/stickman_rope_hero_mod_menu.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/431bfe7b1c9.pdf
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/fiwakelugu-xopuriwojepe-nujawu.pdf
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/nikulurelesuzu-xajimubiw-fukesapadirovi-texaloro.pdf
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5fe8322f7e87d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagobomap/disputing_errors_on_credit_report.pdf
    • https://s3.amazonaws.com/purawuma/nixegivumesefugidokat.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_off0000eef7.bin
6ac7f6a24d78c824634f21e088e717428ee1f5334c111bdb09aa59ccc690326d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5320 bytes
font_01_sfnt_off0001012d.bin
ce0bbdc6f1ab405a190e59fa19d2e7d247a6e486923f3822db079867d16a6a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10792 bytes

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