Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae0986c5cfcbad3…

MALICIOUS

PDF

81.9 KB Created: 2021-05-16 19:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 49c08b2c58d491a13f6d74afd815c24d SHA-1: eb309a4337da7e67da7d91e2cc071606a2393868 SHA-256: 7ae0986c5cfcbad3877c0f6559edcae2bb47665d38e45179fa5626966da16e3e
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classification. The embedded URL `https://yafferge.ru/strik?utm_term=the+stranger+albert+camus+plot+summary` points to known malicious infrastructure. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to disposable hosting suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+stranger+albert+camus+plot+summary In PDF document text
    • https://cdn.sqhk.co/soletibedix/8bieaih/chogada_tara_video_song_hd_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/0ia1yha/ria_money_transfer_mobile_money.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/what_are_the_three_basic_parts_of_a_newspaper_article.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/76703011011.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/other_people_s_houses_abbi_waxman.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/63523502872.pdfIn PDF document text
    • https://cdn.sqhk.co/lojavowi/Bhghi7W/91094324432.pdfIn PDF document text
    • http://lejazubi.iblogger.org/16260774816.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/jbRdJIJ/tumblr_running_to_the_finish_line_5k.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/corporate_bylaws_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bb7d83-84bd-4b04-9609-a62e89c64136/what_language_is_god_of_war_theme.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/kevotegupurugesif.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/babur_gaan_laden_asil_polai_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd9749c-af79-488f-94e0-6ca6039efede/foribapopemisopelowipiga.pdfIn PDF document text
    • http://dokaxakamuwu.rf.gd/pukiliratararex.pdfIn PDF document text
    • http://solarujarinobo.myartsonline.com/athens_and_sparta_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/dewalt_dws780_miter_saw_reviews.pdfIn PDF document text
    • http://senesijosezetu.myartsonline.com/dawilulutosurepufumuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3b3949-2215-4c05-9740-55e9da776f10/kuwobokejef.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/vavuzobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ceba38-55ea-4a2d-9ab7-5837eaea7480/new_2020_lexus_rx_350_f_sport_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcff8e7-f9b5-4851-88df-4d8609fa2b4e/is_singer_the_best_sewing_machine.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_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 5536 bytes
SHA-256: af704d56ce3762d5db66b40f73e87f841d6144b3a12d450c030a5b3a44fa7bd5
font_01_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 11088 bytes
SHA-256: 5030f875a7baf235bf8bc8c1fde4a5e016125f157346ec42503bfccb2083a41c