Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04b2741c4648a11…

MALICIOUS

PDF

84.3 KB Created: 2021-03-22 07:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9c5888e856d0a9f1e305256eea9b1f1 SHA-1: 90ede075f51cbdda35d8d44679954cfb614ed83f SHA-256: a04b2741c4648a11579c6b3d677a7ada70d186bba35c3b30ba157e6fe7639868
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or disposable hosting services. This indicates the document is likely part of a link farm or phishing campaign designed to lure users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • 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://dafemum.ru/123?utm_term=catwalk+instrumental+music+free In PDF document text
    • https://cdn.sqhk.co/bolomadu/MiajgBr/jevugewinitew.pdfIn PDF document text
    • https://jipovosu.weebly.com/uploads/1/3/4/7/134728388/962ea55.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/7jawiUy/wadanazosunokaku.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/kerepuriwakibo.pdfIn PDF document text
    • https://bizonununifewe.weebly.com/uploads/1/3/4/7/134773553/webupomepuzavemizixi.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/gfkHrCT/77156599054.pdfIn PDF document text
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/xowar.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/hh8KNh6/63297599717.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/kkhdXgi/senaredoligusogi.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/buruwo.pdfIn PDF document text
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/jateza.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/NgdPLuy/football_club_president_game.pdfIn PDF document text
    • https://povoxiguda.weebly.com/uploads/1/3/4/0/134016665/828216.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/by0ghgj/murder_mystery_party_kit_for_tweens.pdfIn PDF document text
    • https://medisavepa.weebly.com/uploads/1/3/0/8/130815026/7358785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e722ba-c43a-471e-9966-a468b8be5b53/muxubepesezukuzada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afa1885-72b2-4205-bc17-2f4333045b74/jack_and_the_beanstalk_story_printable_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d701f6-1924-4989-884c-17d15ee27bd3/beowulf_film_online_subtitrat_in_romana_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01b9b27-cc77-48ad-bc06-be5eeb96a823/sozetivikisomut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3e2623-ad36-4bc1-8788-9016fee5534e/88143530130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b220f515-6bee-415b-aac9-e7f89ccc962b/what_colors_symbolises_chaos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdeda83-0f09-494a-8b5f-87d9db530420/96422824445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71f36ce-3499-42b0-942b-339cda29acbf/17625789321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90da1eeb-0a1b-468e-bb78-6ff066e06171/mamejisijesu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 5088 bytes
SHA-256: d45cdc12aee5df0fb6d90fe82b6abd29b6f5edabb46bef1307409d0338d88bb8
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 11448 bytes
SHA-256: a764cdef0f2ff29b400149082b5443a3fec8ba88965565ec8c2ed2a63e694830