Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d09266901f90d1c…

MALICIOUS

PDF

88.4 KB Created: 2021-02-22 13:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8f523ceebea643fcfc98c0684fb8ecfc SHA-1: d35abb5eb70b451cf53ad707020596a4b2cdd308 SHA-256: 7d09266901f90d1ce383c48ff5153cd4a37d2e222ee86cbeec0f6a67b7c3631e
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially harmful content.

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
  • 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://druttle.ru/strik?utm_term=where+do+buddhist+monks+live PDF link annotation
    • http://letxxnx.org/wifuteluwitogakokabazaralqs3wn.pdfIn PDF document text
    • http://ridunculus.com/3ds_roms_google_drive7mroc.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/gfsidic/31068608575.pdfIn PDF document text
    • http://tortomsk.ru/mind_diet_recipes_ukbbqjc.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/aXoXxja/train_accident_in_level_crossing.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/ighj2gi/nuclear_chain_reaction_definition_in_physics.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/hb4iahh/sofunajijutaruxeludobijiz.pdfIn PDF document text
    • http://mishabelle.ru/7003549734xz8is.pdfIn PDF document text
    • http://draiwenstore.online/guia_completa_calistenia_gratisc39sb.pdfIn PDF document text
    • http://ogranifruit.space/6520893484lriyx.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/5nphghj/galaxy_star_platinum_over_heaven_a_modded_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/eggOgcL/nedisatepusumisek.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/heidJf9/51548102950.pdfIn PDF document text
    • http://comp-arenda.site/one_punch_man_a_hero_nobody_knows_garou_dlcxq7wn.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/hi0ieir/kubra_ez_pay_richmond_va.pdfIn PDF document text
    • http://fofoketezifofi.22web.org/after_effects_text_animation_software_free.pdfIn PDF document text
    • http://apkweb.net/measuring_angles_worksheet_grade_5qja8i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakipewoze.rf.gd/vcruntime140._dll_microsoft_2015.pdfIn PDF document text
    • http://bavutikoguvumit.rf.gd/trx_chest_workout_youtube.pdfIn PDF document text
    • http://vemexomejolu.epizy.com/2156964454.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_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 5132 bytes
SHA-256: 87ac52c010bd718b40ca411aac64417ac7c765f0ad9fc65c4a454a9313892002
font_01_sfnt_off00012e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 11228 bytes
SHA-256: b7d580967dcc18c1906fa53743748517e66f34876c3c1705b66d254ea4344fdc

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