Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cfccf5b700dfc5…

MALICIOUS

PDF

87.6 KB Created: 2021-03-20 22:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 238f0025b09765983678a9025ff1cd5e SHA-1: 28c2d909dfa7dd5739435940803c3eb656a9b589 SHA-256: 09cfccf5b700dfc5680c91dd61c8b8ce8170573dc3983dcaf793b06b9084161e
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to suspicious or unknown domains, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=download+hybridization+in+chemistry+pdf%2529 PDF link annotation
    • http://bestplacefor.rest/rawozenafokujesolugudet29x7.pdfIn PDF document text
    • http://topcreditreport.info/bigurifixcbb8.pdfIn PDF document text
    • https://jadomurujamum.weebly.com/uploads/1/3/5/3/135326923/dovemasasogevi.pdfIn PDF document text
    • http://claire-irk.ru/the_book_of_enoch_free_audiobookok8i2.pdfIn PDF document text
    • http://finansi-7.online/sims_3_custom_worlds_not_showing_upds6sa.pdfIn PDF document text
    • http://feedbacrnz.space/zadirudesixorowi9d5n.pdfIn PDF document text
    • http://dressnbuy.com/do_you_cook_brisket_fat_side_up_or_down_in_the_ovenhq6rs.pdfIn PDF document text
    • http://tur8osale.site/80207882364yuyyj.pdfIn PDF document text
    • http://esplus.pro/836949493jhigg.pdfIn PDF document text
    • http://sell-toclick.online/576232754045zlqs.pdfIn PDF document text
    • http://coolmag.biz/adrienne_rich_when_we_dead_awakenv2b5k.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/bujozubanunikisivova.pdfIn PDF document text
    • http://gufutaca6.xyz/5814780461954gt6.pdfIn PDF document text
    • http://sunny-web.ru/golden_boot_winners_2019_2073zrp.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/bb446d5f-2cc5-4aaa-ac29-789cd4432007/29435319165.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_025f51c11d354fb8b53f2191555ee375.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_30ee7968a98d4b929c16672c06400e79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7496678e-ec03-443e-a30b-19d00f276d15/lirozogemawetojojesov.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_c77efb220c2349a5afc76cb6b865f71d.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_13b361bbbc754c698240ea9206d5e72d.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 5852 bytes
SHA-256: 4d2922b96400cf7f05c622a6a273b7a436f46c8bc75aa4b46d337626d6fa423e
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 4480 bytes
SHA-256: 752c7cc23917d1a5403ffaf654ce71a341615e80a284205229ca3c68b0b8b9a4
font_02_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 11684 bytes
SHA-256: bed157337e69075367532b34896b694d94c1fa57c8fcb07217c0169f14d67422
font_03_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb