Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9dc1c50b1ce0bb…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 01:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 350c0d9eb240fa33263971f765810f1a SHA-1: d6018ac09265aa36398c8dc0df671a59be9ef559 SHA-256: 5c9dc1c50b1ce0bb105fca32c721ea2336ef8122b6a05ea5de1cc319f9be6973
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, many of which point to potentially malicious or unknown PDF files, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=cucm+10.+5+bootable+iso++free
    • https://cdn.sqhk.co/pofakedajavo/hajfeWf/endnote_citation_format_superscript.pdf
    • https://cdn.sqhk.co/dixufeja/jgjigjg/knife_smash_game_download.pdf
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6039d4de7ae8b.pdf
    • http://uniques.space/opposite_adjectives_esl_worksheeti6j4t.pdf
    • https://cdn.sqhk.co/gopilufifeda/bKAjejg/ronefakupod.pdf
    • https://cdn.sqhk.co/fivodewile/gcDhi4y/best_clash_royale_decks_arena_13.pdf
    • https://cdn.sqhk.co/vedukosamo/grgd4hc/folk_religion_meaning_in_bengali.pdf
    • https://cdn-cms.f-static.net/uploads/4495994/normal_6032d6e1308fb.pdf
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/9037848.pdf
    • https://cdn.sqhk.co/pategazikiw/aE9jd97/70842046996.pdf
    • https://cdn.sqhk.co/munuluxel/yuSjbMa/leros.pdf
    • https://cdn.sqhk.co/goxufime/gcuk5GT/59137880505.pdf
    • https://cdn.sqhk.co/nunexijezep/sjdhhy6/janusisalivikelose.pdf
    • https://cdn.sqhk.co/nafumozuwe/VhioiaP/robanidowozudomudedogogep.pdf
    • http://lifegirls.site/1994410231184dmh.pdf
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/siludenejimo.pdf
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/5339255.pdf
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/c34ab1828f7.pdf
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/gepale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0fde8e1f-0255-4bf9-8701-27cace0816c3/87786183821.pdf
    • https://uploads.strikinglycdn.com/files/7ae7cb3f-dcaf-48be-b878-9c57eee9534d/describe_the_adaptive_features_of_hydrophytes.pdf
    • https://uploads.strikinglycdn.com/files/d4c66800-0cd7-4dbd-95b1-9d9bd28b131d/emax_blheli_30a_esc_programming.pdf
    • https://uploads.strikinglycdn.com/files/a1c6a952-38c6-4812-a3df-25ab23a5ca9b/que_son_las_inteligencias_multiples_y_sus_caracteristicas.pdf
    • https://uploads.strikinglycdn.com/files/4aa31840-8424-4624-804f-dc6a1c80f35d/61575722466.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_off0000f57d.bin
80ce603efe10a37ba27669f005d13e7cabe9367c852cd00df61fec8cb023d24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 5420 bytes
font_01_sfnt_off000107e6.bin
8471efe5b4c842bdc06d2d985d8088d297d819a92d552446893ba7cee78da26f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 11300 bytes

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