Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d20c9c8a4116665…

MALICIOUS

PDF

90.8 KB Created: 2021-03-03 07:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0b4080c42959b00a950184217f1e71d1 SHA-1: 10d9b9a3ef59b055e8eb3b23e1fc6461e4b77b30 SHA-256: 7d20c9c8a41166657a2fe28f04ca2fb4392fd43e3c9eeeb4a6906e6550ac94a3
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, 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 URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jumiwimov.ru/123?utm_term=tipos+de+archivos+comprimidos+mas+populares PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fe80e7e46d42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463272/normal_6005fcf5e9503.pdfIn PDF document text
    • http://agencymedia-ig.com/783511921589cvaw.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/john_the_ripper_output_to_file.pdfIn PDF document text
    • http://p-kavkaza.ru/foserunamaxawaji3ljsa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_60393945761c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_600025d9c72da.pdfIn PDF document text
    • http://itanto.space/jiwijokuziroz7uj84.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/6440474420.pdfIn PDF document text
    • http://basiditdcf.space/bhojpuri_movie_video_song_20196zii7.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/zafetoguwarumanirub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff4b06c9c568.pdfIn PDF document text
    • http://prizinsta365.online/mukosajap56uzh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/texoxufimap.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/how_to_take_apart_a_nook_tablet.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_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 5324 bytes
SHA-256: e795352bd79d45457359cfff3950170c143b45103b6b443d2a7d670b2a9a8a3b
font_01_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 12608 bytes
SHA-256: 00daa241f8f1a5f65de8ad3f647528eda2923d5a34314e4323ad064af07e4bb8
font_02_sfnt_off00014703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14703 16104 bytes
SHA-256: 25bea5b448335c23564653704c4f6c5477daa4b761eb732fa738313325ef7d23

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