Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f76ad506f5ebd40…

MALICIOUS

PDF

83.3 KB Created: 2021-02-27 06:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 231519b3995d96f9cbc8d69b510aa1b1 SHA-1: 794df90d5fe7ea34bccad3d5a23d66c3788ad69b SHA-256: 9f76ad506f5ebd4032e8886937a7d4686bd9ecc2b169e3a4dca81f3156af474e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://druttle.ru/123?utm_term=alpha+symbol+in+word+character+code PDF link annotation
    • http://mesretly.xyz/jikolimemezejofilebekujthb.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/81867351680.pdfIn PDF document text
    • http://timogefubor.22web.org/le_groupe_la_poste_annual_report_2017.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/pobuzakivararetid.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/dewalt_pressure_washer_3600_psi.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/how_to_draw_the_loomis_head.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_600049e2edc68.pdfIn PDF document text
    • http://ekzo-fruit.ru/padomokm2v2.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/30382298447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6010900f1dd51.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/mivokozibu/how_to_describe_sunlight_through_trees.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/31189335308.pdfIn PDF document text
    • http://medexode.atwebpages.com/where_is_the_kenmore_elite_dishwasher_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/irreplaceable_you_parent_guide.pdfIn PDF document text
    • http://xolazituvote.epizy.com/97013712246.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 5636 bytes
SHA-256: e24b6988c5c4c049bdc4e3f8c09ff53a20acbff6f38b6dc710a7d88fc4758bbb
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 15284 bytes
SHA-256: d75f6d0116a2ca1eb06ac0d57e28b10801bb6cbaf6ae84154868ab052c9fdbfb
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 16248 bytes
SHA-256: 359b44f6370d0d9587578bede86a2dd4472a48d5a5377523290fdda726c37f9e

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