Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9fafede33d919b…

MALICIOUS

PDF

71.1 KB Created: 2021-06-05 03:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5508242f1a3fbef461107a55a3604480 SHA-1: ae84e0cde959277cc3ee559f25eaf8b46ec036c3 SHA-256: fc9fafede33d919baed674c70d1bd2becdf9bd1f2e100ba96ba3dfb7e25ef87a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content, possibly for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/pbw?utm_term=why+do+we+need+to+adjust PDF link annotation
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/414793.pdfIn PDF document text
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/kelopesasawoje-likuxini-widajag-jowanu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475728/normal_5fe598860114a.pdfIn PDF document text
    • https://wopaxosidavi.weebly.com/uploads/1/3/4/7/134732603/4e411477841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_602657b41908e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fc5e77323938.pdfIn PDF document text
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/8198445.pdfIn PDF document text
    • https://fumimukewagur.weebly.com/uploads/1/3/5/3/135321221/masanorutami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fd0a57a03825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_60651f43d7538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_5fd1feb724c8f.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/lulirubuwexenegi.pdfIn PDF document text
    • https://gorasugaki.weebly.com/uploads/1/3/4/7/134766712/wakeperedube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_605be13d8e7e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezawagiga.pbworks.com/f/spiderman_mod_gta_5_download.pdfIn PDF document text
    • http://wurutaw.pbworks.com/w/file/fetch/144493374/examples_of_internal_conflict_in_lord_of_the_flies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0121f3b2-d82d-41f6-bc1a-521d00ad6a42/77667510872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4173c3-7ea6-41b8-8e76-794dde6d5ed7/how_do_i_google_search_a_picture_on_my_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62408fca-ce16-429d-a8f1-06fc4087a2fe/under_the_dome_season_3_episode_2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d527e4-0a21-4fcc-8761-747e17ab33e3/does_kirito_wake_up_in_war_of_underworld.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/56728296018.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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 5068 bytes
SHA-256: 948057c6e17d1ad7aa9d0b6d4b15a92705969cd2f22ea4c376e18befd8bbefc7
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 10568 bytes
SHA-256: f1305c64d1e5b36f3e0ea084c5a255bb2454b8648fb4be0f8e44e9d5831d181f