Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70a34fa120f003f…

MALICIOUS

PDF

75.0 KB Created: 2021-05-24 20:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fd7b838885205ec0a3d4b0880ae5853a SHA-1: 27b9e41743b1899d44f06d3162dfdb7232d00305 SHA-256: d70a34fa120f003fb8f7680aad1d7c04c8a5818e7f895f72df4a7ca7e4e8e0d9
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to benign-looking PDF documents, suggesting a link farm or SEO manipulation tactic. One primary URL, 'https://jacksth.ru/strik?utm_term=mecanica+de+materiales+russell+c.+hibbeler+octava+edicion+pdf', is identified as a potential malicious redirect. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to a password-protected archive delivery, a common technique to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=mecanica+de+materiales+russell+c.+hibbeler+octava+edicion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374533/normal_60489561f39f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_606784c440c9b.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/415678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417535/normal_5fe05a90c1269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_6027b508a1a06.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/litogobowuto-rosap-nexezorabagesul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_6034113873d0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xomepixo/integrated_math_2_volume_2_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/how_to_write_a_charter_for_a_nonprofit_organization.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/funnel_visualization_report_in_google_analytics.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/179363630.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/76637719527.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/safejusopapopu.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/fanreport_burgenland_2_liga_nord.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/wugerasibefatuzixepuxepol.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/the_caged_flower_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/wow_wotlk_enchanting_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/saucony_guide_iso_women_s_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/john_deere_345_seat_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/obstacle_avoiding_robot_using_arduino_code.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/keiko_matsui_music_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 5516 bytes
SHA-256: b884a89cfdbf06a184316ef1642cd94921b3ba381f48094b6a22229fb581f715
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 11236 bytes
SHA-256: 506cfcf1fc80e751dea4ececd70dca1fccd276021038ac01a91c8a130f582e1b
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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