Malicious PDF — malware analysis report

Static analysis result for SHA-256 b759a669a561323a…

MALICIOUS

PDF

75.9 KB Created: 2021-05-17 14:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df1a9363a6ef54c7cd7d5a985452b051 SHA-1: 91fad9b5fd5804acddb1e7839cd73609a8601cbc SHA-256: b759a669a561323abff8c2394107647468fec544fc27e1cbd12cbda6231e3c37
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=delta+gateway+4-in-1+crib+instructions+manual PDF link annotation
    • https://cdn.sqhk.co/temududote/jjiwRtV/piggly_wiggly_hours_in_winneconne_wisconsin.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/B6ggxo7/car_racing_games_unblocked_online.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/bihRUfY/sliding_number_puzzle_game_2048.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/pifRgjF/rukifo.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/icgjhaA/naxowu.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jd3DeH8/2089787779.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/W1hP1No/woranewigavinilizusotim.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/OvQhdDo/46239324608.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/zAvifNA/40376330763.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/cjaifhb/heart_touching_quotes_for_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/c2gcmgg/king_s_raid_hilda_special_dungeon_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_80c3cd72c254466e98c52de3f5b42ea5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9925ebe4-a49f-4f10-9d76-0c24ac11c931/42237535985.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_9a78cc16e40a4086880afaa2c7a00c8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/352856f9-c138-4870-99f9-817519231ba5/tarascon_pocket_pharmacopoeia_2020.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_1ee4b320cbf24b6f809c772bd6f7a27a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0968a3ab-8363-4700-b644-b5288b52e01d/86035516500.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b247fdedfe0a4f038d080ea25a6d77f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5287a92-651d-4497-90f2-286b0facbc47/44937229256.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_9d224556e5234434a83e420baa0daf08.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_6fcdb4c244bf4ca6bca0b0c0710efe31.pdf?index=trueIn 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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5624 bytes
SHA-256: caca30337d14af185159a16c6112e36fb65ab085009246176fce200634adc90d
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10560 bytes
SHA-256: 9bd69d919b5ae2df5a88ad6caa1d6d1e5fffbb38a7f79cd7f81780b6d949cbff