Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0d658c9100c65f…

MALICIOUS

PDF

66.9 KB Created: 2020-12-24 18:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 90186d8e61b884ebf7909d16ad94f03d SHA-1: 6b00c161f6e0807f59aee97c9c17345e99440ce5 SHA-256: 5f0d658c9100c65fc13b218f8a56be74835cc498b8f146b8fc5eed1cd64a92da
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary URL, https://cctraff.ru/strik?utm_term=ant+bee+colony+algorithm+matlab+code, is identified as a malicious redirector. This indicates the document's purpose is to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/strik?utm_term=ant+bee+colony+algorithm+matlab+code In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_5fdc2b6c65022.pdfIn PDF document text
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/9b0b6b0708b.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/sybZjbn/logo_maker_logo_design_generator_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/nianajg/goveruzogijuf.pdfIn PDF document text
    • https://lidikizibapusak.weebly.com/uploads/1/3/4/8/134883913/dimesowoselufa.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/sefobulagupesajezak.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/ihbEmbL/screen_time_passcode_recovery_ios_13_free.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/bunubamozu_senevixiwo.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/7837021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5fb6d37d5d476.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/sivovawi.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/4e0204e3d4.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/8533305.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/2550996.pdfIn PDF document text
    • https://wemugevesusufe.weebly.com/uploads/1/3/4/4/134467109/761273f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/yHYhbgd/zombie_live_wallpaper_gif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 5408 bytes
SHA-256: c0bb3d2d36d3bb91ebef3e4245555a5df7a6732060f14c5d822de427d9a4b618
font_01_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 11648 bytes
SHA-256: dd93e4014b8a0cd9241b384c453cf752c2d5a58ccf81f9df9b82845ca96880fe

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