Malicious PDF — malware analysis report

Static analysis result for SHA-256 1389a887a19b6963…

MALICIOUS

PDF

77.3 KB Created: 2021-02-12 13:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a425635086c51ff3b73538aef3e74852 SHA-1: 9ea3f9a4990468435d0979d76ccf5d3cea7aa727 SHA-256: 1389a887a19b6963f0f44495a77018a7df65da798cc23d0bd8d1ecba2dd788d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various domains, including disposable hosting services. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan PDF. The primary function appears to be directing users to a large number of external URLs, likely for SEO spam or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/123?utm_term=updike+a%2526p+tone PDF link annotation
    • https://cdn.sqhk.co/duxadikoti/ha0uCx1/give_me_directv_phone_number_please.pdfIn PDF document text
    • http://power-guard.shop/79455968604xl68d.pdfIn PDF document text
    • https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/teminurexoloxovoja.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/idfgjjj/48866791730.pdfIn PDF document text
    • https://vewenikeluw.weebly.com/uploads/1/3/0/7/130739128/lilosiwujuv.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/37cb43fa1f86e55.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/jgZjcDT/chop_chop_ninja_2018_episodes.pdfIn PDF document text
    • http://xukulos.iblogger.org/canciones_faciles_para_guitarra_principiantes.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/maladineranusona.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hgugsJ3/warak_enab_with_meat_calories.pdfIn PDF document text
    • https://gizumefelaz.weebly.com/uploads/1/3/4/3/134318195/pefexu.pdfIn PDF document text
    • http://varnisvakq.ru/big_fish_casino_hack_tool_direct6swrr.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/d60cEW0/vexed_crossword_clue_6_letters.pdfIn PDF document text
    • http://meetcabinets.xyz/59321405693ndjj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasutako.rf.gd/rufaguxagewew.pdfIn PDF document text
    • http://joriboka.epizy.com/20314976735.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 4704 bytes
SHA-256: 20541005cf5a65ac5baacefdb3d9f08eee2fc4e1e7c4d54db5125ff0b990af70
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10636 bytes
SHA-256: e18245d7c5466a435b821b62cb2153c01434821c535fceb77821482cc7e0aeb8

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