Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8e65e7d545328c…

MALICIOUS

PDF

106.6 KB Created: 2021-02-14 06:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 56b810e4d927f55eb330aa5610210f8e SHA-1: c33bd111fcdfad1cd2a38e293a7d26bf5c4e3d04 SHA-256: 1d8e65e7d545328c2b9c99ea1fd1d175e54db7f6b712204e88dbf2cf6db05b66
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a link to known malicious redirector infrastructure. The embedded links, such as the one pointing to 'yafferge.ru', are designed to redirect users to potentially harmful websites. The ML classifier also strongly indicated maliciousness, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=realidades+3+para+empezar+verbos+irregulares+answers In PDF document text
    • http://latencfsrt.space/blues_musicians_namesk0kdy.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/djjgdid/best_price_go_karts_pigeon_forge.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/81889214053onk51.pdfIn PDF document text
    • http://pubguckazan.com/ntrca_merit_list_8th_to_12thql4u8.pdfIn PDF document text
    • http://biwejobezimije.22web.org/jubizumanerura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_600d5d612828a.pdfIn PDF document text
    • http://strgb2.ru/61565373326jsof7.pdfIn PDF document text
    • http://strahauto.website/fantastic_fishing_charterspdcqf.pdfIn PDF document text
    • http://aydym.club/attestation_d_hbergement_carte_grise3j549.pdfIn PDF document text
    • http://xojakipizixa.22web.org/addicted_2014_movie_fzmovies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ff6632350dcb.pdfIn PDF document text
    • http://thepropheticapp.com/aisc_design_guide_3pu2vu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadufitewaseru.epizy.com/megusibapuvet.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/wixugugakimej.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/speaker_knockerz_count_up.pdfIn PDF document text
    • http://jipesofu.rf.gd/lego_star_wars_3_character_guide.pdfIn PDF document text
    • http://vorawaforase.epizy.com/dedatabijebutojake.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/leborakusewisibite.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_off00015ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE6 5792 bytes
SHA-256: e1939b71622ee21879f23158ca24da423638c72a7588d992a3acd074e900dea4
font_01_sfnt_off000170ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AB 12680 bytes
SHA-256: 9363063cbf434334513de05cb8ca8a6cc179d14fbdb59a618a11074d6afd3570

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