Malicious PDF — malware analysis report

Static analysis result for SHA-256 2219d6b0e8bdae91…

MALICIOUS

PDF

79.0 KB Created: 2021-05-30 16:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 50ee4379288093e479d20adcf78efb1f SHA-1: 805ac74176f8c2a79558a81022c86e161e3cfbdd SHA-256: 2219d6b0e8bdae91e936776205e7302ff2513ccdabd1d7544a85d46635c92d14
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary URL, https://botokaw.ru/123?utm_term=resume+templates+word, indicates a lure related to resume templates, likely to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=resume+templates+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474170/normal_6023f7aab9164.pdfIn PDF document text
    • https://wuzetawitowozuz.weebly.com/uploads/1/3/1/3/131381497/5161934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_6060289f747a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fe34b609905a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_605a381d4aba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_601986d9c0df4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5ff16af152f88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fc8aae8c5df0.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/7616f975.pdfIn PDF document text
    • https://gojanevalu.weebly.com/uploads/1/3/4/3/134353606/sidesozorutudu-reponafoxobe-sojonixizuxizub.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/7778356.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/zebopamarugar.pdfIn PDF document text
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/51bc3.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/992ba4f9-b635-4e3a-b97c-9c5d9499b5f9/sap_fiori_front-end_server_4.0_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42783f8-1bbb-407a-a615-11ed482aec01/79859707589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d88505-3169-460c-b5c1-e1573719da5e/82280898999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6760670-23ad-4c25-ba14-64a0e13d306e/astronomy_101_lab_answers_csi.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_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 5204 bytes
SHA-256: f74cbf3837825046ea40dc50a8f3889b774db8db8d1546cb36ca25580202f22a
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 12464 bytes
SHA-256: 8430e1a154cdab4eeef2eca6771ec99626b1b1cea7760cee70749e751524c07f

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