Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a430ac5581d3e68…

MALICIOUS

PDF

77.6 KB Created: 2021-05-15 08:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f6836258c8e7b61dd132cf0ac6d5e7a SHA-1: 1017989b0cdcbf21911f304657363439c1f46e5e SHA-256: 5a430ac5581d3e681513fdb14e541af5f3b10fa5c288bb47c4b7510fee23dd05
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many of which are suspicious. The document body, though partially corrupted, suggests a lure related to computer services pricing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the presence of external links points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://crophysi.ru/strik?utm_term=how+much+to+charge+for+computer+services PDF link annotation
    • http://miwewumexurigan.sportsontheweb.net/19849627044.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/sorokib.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/sirowudevorurawovedizos.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/84054187317.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/baermann_funnel_method_of_nematode_isolation.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/atkins_40_diet.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/5th_grade_opinion_writing_prompts_with_passages.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/passive_voice_present_and_past_simple_exercises.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/vipinib/tipping_point_book_free.pdfIn PDF document text
    • http://vogojitipam.epizy.com/vulurajilukopesutaxigupit.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/metformin_tablets_bp_850_mg.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_c8b4c7cd1a2b41a8a95461109921c19f.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_3adaea2b24a44ebfbbd315619e319c2b.pdf?index=trueIn PDF document text
    • http://desejole.myartsonline.com/fikeravurebijunoloj.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/tidominudi.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_c8ea357f005544539522645a97cf2671.pdf?index=trueIn PDF document text
    • http://morubuzis.rf.gd/79460517195.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/87692906431.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/jandy_aquapure_flow_sensor_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/50913082721.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/73922633164.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5508 bytes
SHA-256: 77765b8fe21e65c19eedda44f678298814959d35b0c192aefaf9ddf5014c9435
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 10860 bytes
SHA-256: 5084ca67e4600f0ee9df83b45c0a9fad8f3da24ba771e4ffc4d1e1480914a953

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