Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b9675bc0d529ec…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 08:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85b60c8919158d7e53013b0f5c0c5724 SHA-1: db8f9e2fb480a30b042141b9a3a55dbb40e31f94 SHA-256: 35b9675bc0d529ecffa5f9538a0573ce7106bcf23e6847d8a107e836551affa6
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded links, including one pointing to 'yafferge.ru', which is identified as malicious redirector infrastructure. The document's structure and embedded links suggest an attempt to trick users into visiting potentially harmful websites.

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
  • 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://yafferge.ru/strik?utm_term=2000+ford+ranger+xlt+4x4+off+road+specs In PDF document text
    • https://bowetupivivuz.weebly.com/uploads/1/3/1/4/131437724/gulalebir.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/dJhdwhd/dobaxusidelafe.pdfIn PDF document text
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/fesusopabupu-rowisavuwal-tikasurezat.pdfIn PDF document text
    • https://deparabijafepoj.weebly.com/uploads/1/3/4/0/134040416/kotasep-luzurulijat-wifub-filaro.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/jNje8ia/siren_head_and_cartoon_cat_mod_for_minecraft.pdfIn PDF document text
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/xasupijinaw.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/fxEZ3EI/vimapusamureb.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/l1qzTjd/personal_care_assistant_resume_summary.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/nutolaler_saratonagunew_xipemozobenagog_fijoda.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/ghw3PDY/54305570833.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/Ihbighb/62620118781.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/vokukujasugexu_wutodig_wezokosesifa.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/6955885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibejebovef.epizy.com/lokirejapuxewap.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5660 bytes
SHA-256: b95530f8e4b372012a766ce378542ce1bdb3225b293f42ad85a20623afe42e6b
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10640 bytes
SHA-256: 8067d250eb4187b3c75b169f5391a5c4bd0452753d0a61ef9d8c59ab52bfc119

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