Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1dd7d3a80f6c13…

MALICIOUS

PDF

73.2 KB Created: 2021-03-14 20:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c1617dc833c3487160adaf7a2fa9276 SHA-1: 7e175abead2c16b51cc9fd16fe9ee649d7bb4877 SHA-256: 5a1dd7d3a80f6c13518ac64b76f0fca0ef9993f8ca1832437a957c5ffa1b8d05
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs, with one prominent URL pointing to 'pelibifir.ru'. The PDF's structure and the presence of external links suggest it is intended to redirect users to malicious websites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall pattern strongly indicates a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=space+jam+soundtrack
    • http://zedateve.mypressonline.com/71073769274.pdf
    • https://cdn.sqhk.co/zagakobafot/hnl3ijj/free_customer_experience_map_template.pdf
    • https://cdn.sqhk.co/bexutavukaro/giVpHii/48554394868.pdf
    • https://cdn.sqhk.co/supopareso/j9Lccjd/19102437902.pdf
    • http://zugugalepew.mypressonline.com/bofizaviwenuxipem.pdf
    • http://bridgecommerce.com/bidudil8i2y8.pdf
    • http://mavigawika.scienceontheweb.net/52289230456.pdf
    • http://basiditdcf.space/residential_lease_agreement_templateu1wgo.pdf
    • http://wuwisometojone.66ghz.com/75465340966.pdf
    • http://ketibenugato.22web.org/kerala_psc_ld_clerk_exam_questions_and_answers.pdf
    • http://lemafesopeposuz.mywebcommunity.org/how_to_become_a_chick_fil_a_vip_member.pdf
    • http://palikexifumalam.mywebcommunity.org/nilafunixuxilimoxavixek.pdf
    • http://vk-settings-change.online/111767029qo8zl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ratotepuno.rf.gd/how_to_turn_on_motorola_cable_box_without_remote.pdf
    • http://kabewusibun.epizy.com/the_best_free_gps_navigation_app_for_iphone.pdf
    • http://jisijuvod.myartsonline.com/kojelixobufojonideguwubi.pdf
    • http://sofidusujewa.epizy.com/the_bloody_chamber_book_review.pdf
    • http://ruxomipeb.epizy.com/12041965563.pdf
    • http://gutekuretejapoj.onlinewebshop.net/what_are_the_5_operating_system.pdf
    • http://vezapuro.rf.gd/hotel_cash_drawer_count_sheet.pdf
    • http://jowosos.myartsonline.com/70993453193.pdf
    • 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_off0000df40.bin
bd9b3cdf9f9bfaf0767158ce77edc98e37471914ef88723612f760165953c33c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 5428 bytes
font_01_sfnt_off0000f1a6.bin
c3ce20369dac2add7db1ebd6ed4b9c340f8894badadf49deb312b26eab62bab1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 11468 bytes