Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f2120c98ab03b…

MALICIOUS

PDF

65.4 KB Created: 2021-04-06 18:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9639a59284f8b79a4558f75145882352 SHA-1: d3659cd1df7c2ad019a5e3f7adb0da3c87dd9fe0 SHA-256: 790f2120c98ab03bbabc62fafb076fe6c9a0925f60f3db6fdbe7316aa1208364
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to 'seumenha.ru', suggesting a phishing lure disguised as a worksheet. The presence of multiple external links on disposable hosting further supports a malicious intent to redirect users to potentially harmful content.

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://seumenha.ru/123?utm_term=genetic+disorder+worksheet+answers PDF link annotation
    • https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/97678f0a118.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/92070345456.pdfIn PDF document text
    • https://cdn.sqhk.co/fasegibuniz/4hhoOii/1037581330.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/gubelawej.pdfIn PDF document text
    • http://xuzotudaraderuf.mypressonline.com/lokabiz.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/H5zjghc/9296335868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_602c3bb54ccaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5ffe42b424d57.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/the_evolution_and_characteristics_of_the_information_age.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/jjCggKe/ganobomiletunajapilim.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/small_business_accounting_101.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/11bb5b9e-b012-40b0-9084-12182cf45289/warriors_into_the_wild_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/how_to_design_a_quantitative_research_question.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/43929690455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63dbde2d-b1e1-4aa8-805a-f2bf643b12d2/kufuzigubap.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/30546221678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d5c2d7-006f-417b-9f7d-7617a0972f36/harbor_freight_air_compressor_oil_type.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_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 5184 bytes
SHA-256: 950609cf636b66aef4b60c57f2371aaf54dd16baac7ec2789dd64527ff8cb1a1
font_01_sfnt_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 9508 bytes
SHA-256: 593e2bbc53a61f04146a97135ad39476322afb57ce96372ebb9c52ed56acb0ac

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