Malicious PDF — malware analysis report

Static analysis result for SHA-256 982a1b1cf2f8bf92…

MALICIOUS

PDF

78.4 KB Created: 2021-03-08 01:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 32d6c3741564f0abf8e158462654d348 SHA-1: e9443f900a6cb9da85adf8389149f1c91178ca50 SHA-256: 982a1b1cf2f8bf925df3938c43dfefeb6264a80a693b650f0fa8dec580312a80
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous embedded URLs pointing to potentially malicious domains, and is described as a link farm on disposable hosting. The document body is heavily obfuscated and appears to contain junk data, suggesting it is not intended for human consumption but rather to host links or exploit vulnerabilities.

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://midufefew.ru/strik?utm_term=how+to+grip+a+beretta+92fs PDF link annotation
    • http://hamsterbig.com/how_to_replace_belt_on_whirlpool_duet_washing_machinebjqic.pdfIn PDF document text
    • http://profibrend.ru/92424648898mbop0.pdfIn PDF document text
    • http://aov.one/192317003113xrmq.pdfIn PDF document text
    • http://bioforce-co.site/army_cadets_uniform_australiaddzi1.pdfIn PDF document text
    • http://manthoughtswebsite.website/es50r9-55_100_manual46816.pdfIn PDF document text
    • http://xrootunited.com/13993763668cglmj.pdfIn PDF document text
    • http://natur-bio.space/drawing_for_absolute_beginnerskr0zg.pdfIn PDF document text
    • http://zanartcc.net/baazigar_song_mp40n7th.pdfIn PDF document text
    • http://lajibodomemebev.66ghz.com/dewexosurumutirufixewez.pdfIn PDF document text
    • http://ital-girl.space/amazon_seller_central_account_sign_up3cqo6.pdfIn PDF document text
    • http://detonicro.website/bowflex_xtl_workout_chart_freey3dyx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tonerud.epizy.com/tasebozipuriki.pdfIn PDF document text
    • http://tuwafexom.epizy.com/52383290150.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/euro_stock_market_times.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/dockers_alpha_khaki_fit_guide.pdfIn PDF document text
    • http://zarugosa.epizy.com/koperejajidusefetosinolif.pdfIn PDF document text
    • http://zakuzoresibib.epizy.com/rhetorical_devices_in_famous_speeches_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/basic_english_grammar_book_saddleback.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5200 bytes
SHA-256: 88917d8079e1c29feeed83e1a6bc2966bec78633d4dd432dc2549e8555555a00
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 9924 bytes
SHA-256: 32ee9b545204509cb5f6e07eac627e48ed6384d6bc4c60f860be87c1ace17470
font_02_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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