Malicious PDF — malware analysis report

Static analysis result for SHA-256 979cbf36e4b2b000…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 18:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b7eff4e5f64b4434c94527f49c755d3f SHA-1: 2d10b346547ecb45628c6258176f8fafe0c0bf9d SHA-256: 979cbf36e4b2b000f07cf043fd2fb38661ea06edcbb4700cf49a63ced2560d5e
126 Risk Score

Malware Insights

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

The PDF contains multiple 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. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=scansnap+s1500m+catalina+workaround PDF link annotation
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/f83fe24d36.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/joNxzif/25063703710.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/Sgtj4ns/wrestlemania_rumors_2020.pdfIn PDF document text
    • http://bigpleasure.ru/aircraft_maintenance_planner_salary_canada16u7s.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/fgd5iaR/the_third_day_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/bSgdBje/14994007160.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/d48bec9d4947a7.pdfIn PDF document text
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/e78ca69dd2.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/hehdjgS/spaceballs_trailer_ita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470543/normal_5fcabbd723a67.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/Aidicic/business_office_manager_education_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5fec8e7ce2ac7.pdfIn PDF document text
    • http://community-day.ru/6011413442zmb9n.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/8015997.pdfIn PDF document text
    • http://gajozemexip.22web.org/78578901619.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/4daa7f8cdfb0ed5.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/TgeW5hh/lake_crescent_wa_fishing_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powazov.rf.gd/wujejit.pdfIn PDF document text
    • http://fisubilir.epizy.com/herbal_treatment_of_alzheimer_s_disease.pdfIn PDF document text
    • http://bijalefopate.rf.gd/rise_of_berk_dragons_guide.pdfIn PDF document text
    • http://fedukiz.epizy.com/vobarikegefakazenutit.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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5796 bytes
SHA-256: 75e2041c031545e112a76061d21e89ae3ed6a54175966761b5120436e8030099
font_01_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 12092 bytes
SHA-256: 08e1956fe88e0d271218fe1bd9b3da73e67bc3b6865324371b97fd0cb4f6a398

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