Malicious PDF — malware analysis report

Static analysis result for SHA-256 1143bab40b971b4d…

MALICIOUS

PDF

70.8 KB Created: 2021-02-17 05:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8dcc02f2910c20c61bd90040514e6f04 SHA-1: 28c79077c0fdb20c225f9f87f3ff31092e26d2a7 SHA-256: 1143bab40b971b4d05951854e577e0c0dba76c924a7798e6f87560cfbd3231f1
126 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=kenmore+80+series+gas+dryer+heating+element PDF link annotation
    • https://dujezokedibu.weebly.com/uploads/1/3/4/3/134392169/tuwubirov-fipem.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/ijglkFv/police_radio_sound_effects_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/cP0yihO/gallery_wall_ideas_behind_couch.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/4350641.pdfIn PDF document text
    • http://samozanyat.info/gmail_to_google_sheets_zapier411vl.pdfIn PDF document text
    • http://kawlites.online/machine_service_report_format_in_word21l0z.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/eiahcWj/91216431008.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/8006192.pdfIn PDF document text
    • https://fumevido.weebly.com/uploads/1/3/0/8/130874276/5204896.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/jijosikitak-gafusewug-sibajafoz-toweza.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/4hgihkR/planet_of_the_apes_4k_trilogy_review.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/how_to_reset_2010_crv_oil_lifezk2rv.pdfIn PDF document text
    • http://bigowet.xyz/kawuzafawywku.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/642d4e9204252f1.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/d6ff7de14f8.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/4ee92133.pdfIn PDF document text
    • https://cdn.sqhk.co/tupizurelir/hjl7yLz/gif_papa_can_you_hear_me.pdfIn PDF document text
    • https://cdn.sqhk.co/taranumota/HpjdqDF/salumebiputaxafalopuni.pdfIn PDF document text
    • http://espaceabone.com/36048474617o2wcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavabi/density_fibreboard_sheets.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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 5644 bytes
SHA-256: 3d723cf95849b80330641ea71afc9412f72d3aa769b687a45e13722cfa655944
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 10916 bytes
SHA-256: 8919579605574934fe34e382e1e0cb0081146c3963304c982570addb0bad05a6

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