Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6370b0e61c6f830…

MALICIOUS

PDF

81.9 KB Created: 2021-02-25 17:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5b36bca42a08224573fcfc1c4ddf386c SHA-1: 5f4e5c653cb821d4bece85cae60d5cc505fcef2f SHA-256: e6370b0e61c6f830b85ec2d7e2543b05a84dd10d904338aed4c356541f0fc70c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate that the primary purpose of this document is to redirect users to malicious websites.

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://druttle.ru/wix?keyword=nikon+m+308+adjustments PDF link annotation
    • http://lezeninimi.medianewsonline.com/how_long_have_prisons_been_around_uk.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/noco_genius_gb40_wont_charge.pdfIn PDF document text
    • http://zhigina.ru/80153626053l8g40.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/modo_de_produccin_de_la_comunidad_primitiva.pdfIn PDF document text
    • http://coolvdomaion.online/converting_joules_to_calories_worksheetfb4ux.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/reliability_centered_maintenance_training_uk.pdfIn PDF document text
    • http://stepka2016.xyz/what_is_the_next_nancy_drew_gamezxajh.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/famogulepugekojena.pdfIn PDF document text
    • http://beamorem.com/2020_truck_safety_ratingsfqtg0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ff9bce69e606.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/30668743068.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/short_stories_in_english_for_competition.pdfIn PDF document text
    • http://gasojowil.22web.org/robbery_bob_2_apk_obb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_6006fe51d7794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxusitusumulag.rf.gd/i_am_the_lorax_meme_template.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/82028505654.pdfIn PDF document text
    • http://zukanimi.epizy.com/48728284408.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/the_legend_of_king_arthur_and_merlin.pdfIn PDF document text
    • http://sotatelovutegep.epizy.com/2014_cadillac_cts_v_manual_for_sale.pdfIn PDF document text
    • http://zonizuziguzapi.rf.gd/zolimewo.pdfIn PDF document text
    • http://kedenutorufet.rf.gd/used_lawn_tractor_parts_for_sale_near_me.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 5452 bytes
SHA-256: 3ccceb33d74b8faa7d557ca0159b35cfe35da0bcf1c14635c3f3f02b06b7f6a5
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 11004 bytes
SHA-256: 47ad2cec4add6b198aeb35913e508c54f9bff52b227042b481d935612789eed9
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16240 bytes
SHA-256: 1cbb36bb7b1d233ee9f5c2cce214d5b3269f5c1575f9f3c623519b72eb7db796

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