Malicious PDF — malware analysis report

Static analysis result for SHA-256 516a158705944bc0…

MALICIOUS

PDF

98.4 KB Created: 2021-01-17 12:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 29db971facf2cf02aa72979b349fe8c4 SHA-1: 7c85e051dd5e6efa7f2feb63a098bcef3552c28f SHA-256: 516a158705944bc0a3db6b8586ceb30a73442ad8d61cb6b68da2bd08fbdef7bc
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('traffset.ru') and others hosted on disposable platforms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a leadership report title, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=def+of+transformational+leadership PDF link annotation
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/navagaji.pdfIn PDF document text
    • https://sajoviginuxux.weebly.com/uploads/1/3/2/7/132712139/wafezasizod.pdfIn PDF document text
    • https://site-1180454.mozfiles.com/files/1180454/61219300589.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/0O3rq43/discord_server_stats_bot_code.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/zufiworibudomoxer.pdfIn PDF document text
    • https://site-1175753.mozfiles.com/files/1175753/chudi_jo_khanke_song_new.pdfIn PDF document text
    • https://site-1177722.mozfiles.com/files/1177722/gordon_ramsay_uncharted_episode_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tomaxade/social_media_marketing_industry_report_2018.pdfIn PDF document text
    • http://mevonaku.rf.gd/dutch_zip_code_format.pdfIn PDF document text
    • http://robogotut.epizy.com/godrej_aptitude_test_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/nidegesapokulutu.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/la_campanella_sheet.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/wacom_free_bundled_software.pdfIn PDF document text
    • http://begosene.epizy.com/70086633990.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_off000144ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EE 5280 bytes
SHA-256: 8e88af1213b9520106783a91caec9b7ddf2165348d5333a6b2130b713896eef3
font_01_sfnt_off000156b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B8 11180 bytes
SHA-256: 3e98381c7a0167bec197eef653cd3627d71d353455be858c761b902137486ac4

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