Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ec4f520762a965…

MALICIOUS

PDF

83.4 KB Created: 2021-03-28 06:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3500921bf5f8846dd05f1a5428545625 SHA-1: 516dff665a68c7893408e8c05dac22de067c8570 SHA-256: 17ec4f520762a9655e27650368f37640894529be930aa2b772830da5ea891ed5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of 'utm_term' parameters in some URLs suggests a phishing or malicious redirection attempt. No scripts were extracted, but the overall structure and URL distribution indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/123?utm_term=sentence+fragments+worksheet+2 PDF link annotation
    • http://nesobaka3.xyz/25431721867eb3l8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413231/normal_6048c580edb07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_5fdac753e65f3.pdfIn PDF document text
    • http://uablog.website/sims_4_brittpinkiesimsunle0.pdfIn PDF document text
    • http://gufutaca1.xyz/9397750070ew9mr.pdfIn PDF document text
    • http://doucheop.xyz/magic_bullet_printhead_cleaner_msdsbu6x5.pdfIn PDF document text
    • http://avtoshkola-region26.ru/what_is_chess960jykxv.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/110276491958i27l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5fdaf11875d70.pdfIn PDF document text
    • http://recepty-dd.info/how_to_increase_the_size_of_an_image_in_paintwjeec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5fd5f0c2a70c5.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/jijigc9/55166243042.pdfIn PDF document text
    • http://sarhello.online/24307637612a9140.pdfIn PDF document text
    • http://maewallace.com/animal_research_worksheetlgjsi.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/jdWgd1K/ccm_ice_hockey_skates_sizing.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/ghfQgjh/kofamazeridogisarimuj.pdfIn PDF document text
    • http://roman-holidays.shop/800301644291cdy7.pdfIn PDF document text
    • http://smcjd.com/72754965898rf9kn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_6003ed05e9659.pdfIn PDF document text
    • http://kismykeitio.best/bateria_virtual_pro_apkwsepc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_db08ef96a74141108a7f046dc40db848.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_50bc5221de0b4a48bce39ecf97b7c239.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_dca8fe35dd03417ab62a37705ca23079.pdf?index=trueIn 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_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 5652 bytes
SHA-256: 8e00119951e67c83e3fe69308b9323a50b3821ebc7fe122e785f31d8ae039671
font_01_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 11304 bytes
SHA-256: ea1359c03bc8ff1c58bd0b0182d2defa61d4755a6425f914971d9ff3b474a3a8

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