Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c58295d323c6fb…

MALICIOUS

PDF

67.8 KB Created: 2021-01-17 11:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a1698a6107dcde859372b3ee8312d151 SHA-1: b91d88747e2c07a4df76a866faf19814ad435c77 SHA-256: c9c58295d323c6fbedf114629a44fd6856e814258b31450df3d627782d8318e6
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple links on disposable hosting further supports a malicious intent, likely to lure users to phishing sites or download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=sdr%2523+windows+10+no+device+selected In PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/2057815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fe7b18a45074.pdfIn PDF document text
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/6022836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5fa430cdab30b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368249/normal_5fcdc96fe6fe1.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/36037294956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fad6799cd61e.pdfIn PDF document text
    • https://site-1172409.mozfiles.com/files/1172409/noble_ok_golf_carts.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/5efb0ba.pdfIn PDF document text
    • https://gumotijilazu.weebly.com/uploads/1/3/1/6/131637190/ragulejalurabazobi.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/glitter_wallpaper_for_laptop.pdfIn PDF document text
    • https://site-1205711.mozfiles.com/files/1205711/phoenix_brand_management_group_indeed.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/vatosolikijike/simple_rental_agreement_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/zedefisebegako.pdfIn PDF document text
    • http://dujepuxa.rf.gd/68466792947.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/stubhub_seatgeek_partner.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/how_was_your_sleep_answer_yahoo.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/small_of_back_holster_beretta_92.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_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 4496 bytes
SHA-256: d298a5a83162381dde6eb50d58341ca863de8cbab46715e397d86dfe20647262
font_01_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10408 bytes
SHA-256: e12cd58004b04f2d0de4a52d553ca104145c7d31bea8055de335738810ac3b65

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