Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b9f8623ee0d00a…

MALICIOUS

PDF

76.7 KB Created: 2021-04-09 22:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 444d2708c9270c2cc20ddf2114a3c54f SHA-1: 9ebbc60c3c705581f963a5f1a82d84cc57c46564 SHA-256: b2b9f8623ee0d00a872162d0e06da636326798ea74d9f4db052c86ae4231f8e5
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 0.9998

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://gimoguvi.ru/strik?utm_term=living+air+purifier+repair PDF link annotation
    • http://xalenupom.getenjoyment.net/kitchenaid_repair_store_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_60300d392ab9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_602d788676f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_605f9158818d2.pdfIn PDF document text
    • https://vokinojen.weebly.com/uploads/1/3/4/8/134851280/pawavolirawowavu.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/G3XXUif/best_photo_editing_software_for_beginners_pc.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/90995845867.pdfIn PDF document text
    • https://cdn.sqhk.co/xogutozo/jfhii2c/can_i_buy_ebay_gift_cards_at_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/2Hjbgjf/crypto_idle_miner_apk_download.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/paxafol_rozapapibowibit_budetenonovuros_riperatu.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/resubegumomavokifibenavu.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/3339514.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/complete_estimation_and_costing_of_residential_building.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/gi8qjeI/captions_for_christmas_photos_with_dogs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gukominutokowu.epizy.com/ale_house_denver_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/essex_bus_route_91.pdfIn PDF document text
    • http://dofusuzi.epizy.com/does_ch32o_have_a_dipole_moment.pdfIn PDF document text
    • http://wuwututosexatep.rf.gd/47810628999.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/altec_lansing_lifejacket_3_waterproof_floating_bluetooth_speaker.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/87468489965.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 4860 bytes
SHA-256: d0bc34f6195a9272bed26964d01746990f012394dcaba705400626744fa9085f
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10864 bytes
SHA-256: 6a6021ae928cbbfcf632278a354fe8bc2a71608da93327af2188fa01e7d45a3f

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