Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf471ef872988d5e…

MALICIOUS

PDF

85.8 KB Created: 2021-03-29 03:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 01ff99460b9abda1aac3ec7d45edee10 SHA-1: 49ac6eb7dc4ba3575458ab07faec70ca677ec289 SHA-256: cf471ef872988d5e0efe05ac8ab70023354b6402472028a1a0715cb30b675206
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on disposable domains. The embedded URLs, such as 'https://resalured.ru/award?keyword=alcools+apollinaire+pdf+italiano', are likely used to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://resalured.ru/award?keyword=alcools+apollinaire+pdf+italiano PDF link annotation
    • http://dilomevoje.22web.org/creating_character_arcs_weiland.pdfIn PDF document text
    • http://leledup.mypressonline.com/lasiraxipa.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/5Ribcjc/classic_ping_pong.pdfIn PDF document text
    • http://mutuvukawawe.22web.org/34321779032.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/bjfwsS3/49545377861.pdfIn PDF document text
    • http://khareedforosh.com/does_directv_work_with_apple_tvuw1k4.pdfIn PDF document text
    • http://afracheat6.xyz/when_you_wish_upon_a_star_disney_lyricsjszvx.pdfIn PDF document text
    • http://zebisol.mypressonline.com/priere_pour_attirer_l_argent.pdfIn PDF document text
    • http://save50.pro/xedejorometubonlhoe.pdfIn PDF document text
    • https://cdn.sqhk.co/buxoxurobewi/hURggji/reuters_news_us_election_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/L9hjjjd/26791456161.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/altes_land_drte_hansen.pdfIn PDF document text
    • http://fakaripeti.xyz/macmillan_gateway_b2_workbook_answers_unit_5bf3b4.pdfIn PDF document text
    • http://sodalabs.club/rca_50lb45rq_wont_turn_on8qq8t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_d7ac126df4984ee7a5eb977f77728816.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_7f4bc43de1ec4cd0964c6f6058c5ecbb.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b4c4718162864e7087e2737cf8deab8a.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_228fc0e006e24a66a1f4c855124bf91d.pdf?index=trueIn PDF document text
    • http://sopuvezek.rf.gd/18940189371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a43ec8e-a31a-4b39-b081-26ead2408ef9/ciclo_de_krebs_paso_a_paso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7ff2b5-d05e-4c60-8df5-abd87500b5b7/demofojugosu.pdfIn PDF document text
    • http://zobabof.epizy.com/38088029981.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_b097203679174f5d8f6fa28d4637139c.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_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 5140 bytes
SHA-256: 87d31b621a600fef87cdce0bdf2cad7cd569d311e4606227e9d65b6573f58cf3
font_01_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 14420 bytes
SHA-256: 4951c069eec3d8ed2c7e232e6880b331fe4f9fe1b845da367722263fd46358d7

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