Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefad1348532129b…

MALICIOUS

PDF

110.8 KB Created: 2021-03-19 13:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 349bfaecb8aab0b9d70af19ccb419dec SHA-1: 4a0c5b0f72befdf4e0ed9956c1ca48ba7eb962a5 SHA-256: fefad1348532129b81200850802bc840b53d5cfbc118dd8255811d44047d32c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/wix?keyword=lenguaje+de+se%25C3%25B1as+universal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fda3ae13739d.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/Isihcbf/28912583141.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/ieqcoRE/91212097147.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/edqhguf/sopateguguk.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ijgfwS6/53838834974.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ijhDNMm/73380974096.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/igJje0r/41936702336.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/hhfzKgj/14482562080.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/MouYKij/70355973597.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/GKhgMgc/88949048503.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/mgchjhh/silicon_valley_season_6_episode_3_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_5fd3107ca9912.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/jdgj6ge/gesejamuvilaxokorexumij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_be42423b7163429c946ed5aec23f1611.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_abb55aba94b04e26bdbd42fba0590990.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_5d5e8ebc0dde45b0a9ac12bfdc07d2fb.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_b3164385fef54c809f59d2e81b715182.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_d89a537865234aa2a0cb1696c3f02139.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/38313090524.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/29_cfr_1926_osha_construction_industry_regulations_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/jaful.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/best_ecg_book_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/zabage.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3E 5280 bytes
SHA-256: e2ae0f59e0b8c31abec91ba4ea26398a2e3fc8c81eb8798c29c449f16a014bc7
font_01_sfnt_off00016c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C12 13196 bytes
SHA-256: d6e8b63c68093098fa7a92ed4d580dd65cefcb153b8eca0cfc6f9fc1e41a92b8
font_02_sfnt_off00019654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19654 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953