Malicious PDF — malware analysis report

Static analysis result for SHA-256 facf13120a812726…

MALICIOUS

PDF

74.8 KB Created: 2021-03-25 05:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51f5cc2678ca62dbf4a0982bd090c5a2 SHA-1: ee322f05da324cb3bbb558f8d265adb635bf16b0 SHA-256: facf13120a812726133c06f2540ed2c3971c606f51cb84f25ed3bb4f8755f54d
156 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, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. One of the extracted URLs, https://pelibifir.ru/aws?utm_term=waiting+for+the+barbarians+book+themes, appears to be the primary entry point for this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/aws?utm_term=waiting+for+the+barbarians+book+themes
    • https://cdn.sqhk.co/katutilit/iejd82l/1400802007.pdf
    • https://cdn.sqhk.co/vimitewimuwi/jQiguUE/jurozipomopu.pdf
    • https://cdn.sqhk.co/zolususux/iF1ghhd/troom_troom_en_espanol_2020.pdf
    • https://cdn.sqhk.co/tafolaku/dgfXnjb/76588617268.pdf
    • https://cdn.sqhk.co/gojinuma/zmPWXji/bts_songs_2020_youtube.pdf
    • https://cdn.sqhk.co/zetuzire/ichehfL/costumes_near_me_for_rent.pdf
    • https://cdn.sqhk.co/bemoranoz/iiicgdK/u_mobile_centre_seremban_branch.pdf
    • https://cdn.sqhk.co/popenewosaso/eUidmgj/62309318200.pdf
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5ff7df991bd2a.pdf
    • https://cdn.sqhk.co/noviraxat/lQvsVhf/silidajazedetovo.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6018a4832f0ac.pdf
    • https://cdn.sqhk.co/gudijupimeb/ejbbHNu/vogezabujajawinona.pdf
    • https://cdn.sqhk.co/baxorurifina/NiiUyUO/live_space_battle_wallpaper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_1cf43951adde4234a0cd39d650391e07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0619d209-8752-468b-86b6-fb02bd5f9521/74097724409.pdf
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_6ca8db46e6944ce2a17a70414136438c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d7afbf4-daf3-47f7-b175-e91beb0416fc/witotinekikazinujeme.pdf
    • https://uploads.strikinglycdn.com/files/233406e5-6708-40bc-9ab5-f6d9cf6f2cdb/31271907027.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_affade366fe64e6f825c3dd6b5e54811.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60b.bin
f0c75d99fd19463adbedd497aff0c0503736f3d38dae87ea59225b6c833ba00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 5364 bytes
font_01_sfnt_off0000f836.bin
5bc7fdb84c70b3d3e0d7634d6966ca38ea50267ce288965212e71ea48c7616a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10492 bytes

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