Malicious PDF — malware analysis report

Static analysis result for SHA-256 71659bfade773b0b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 11:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 890bc9aa7a433a63dfcaa54a9101f496 SHA-1: 850ffe7ba94a5ff8aff67aaded6fbb6348a1042b SHA-256: 71659bfade773b0b86e234c54fefbd784d5c4ed71a7079fff4c4673931920f7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/strik?utm_term=how+do+i+get+my+mac+to+recognize+my+wireless+keyboard PDF link annotation
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/tesudutebi-lutex-gepuwen.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/gidEVjd/5505395144.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/wirobinotepojage.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/FiaBgfD/maize_maze_nyc.pdfIn PDF document text
    • https://nivuzodix.weebly.com/uploads/1/3/1/4/131410872/00bb903a4f927c1.pdfIn PDF document text
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/2966803.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/6bb1064.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/4177525773.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/how_to_ignite_majestic_gas_fireplace.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/d48212f011.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/automobile_technology_sinhala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/330ee0a0-fc25-48d8-a6b3-5e197260d523/suvawome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd24394f-e481-4c42-a207-810584605db1/intermatic_timer_t101_wont_turn_on.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_798a24ccf7484b228d0fca5f5fc5f387.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd51788-1ed3-4df9-9457-826fdf6bf2b2/how_much_to_learn_graphic_design_in_nigeria.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_0b96450e63d547de9162f85843d62858.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/amazon_balance_sheet_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311a80a7-9dc5-467e-b881-57911e85c560/motivational_interviewing_education_intervention_for_nurses.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 5668 bytes
SHA-256: 1a57515bb1ed1cc28b73004e5e7aaad35f3a3039815d1c26aa77367d71c3f59e
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10872 bytes
SHA-256: d00bf38e306af3e404b0f079d02d83f1b972cfbb76c1fd00bf79b1297ce5552b

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