Malicious PDF — malware analysis report

Static analysis result for SHA-256 b413737e591d4160…

MALICIOUS

PDF

67.1 KB Created: 2021-03-06 05:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57fb100146ce0ddd8348a96d3e3b0474 SHA-1: 30fc089cdfa6995a8345ee309ef7c0bf55ab5d6b SHA-256: b413737e591d4160111375f071a7f41c10d2279fb439ecb56364b7c9314227e9
156 Risk Score

Malware Insights

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

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 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.
  • 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://ponafet.ru/aws?utm_term=how+to+start+off+writing+movie+review PDF link annotation
    • https://vokanuxuvewelar.weebly.com/uploads/1/3/4/6/134618840/zuvap-zotak.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/1hbh1if/dc_comics_movies_in_order_of_story.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/losokuvomuxuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/P7ijgiw/fenajafubitoza.pdfIn PDF document text
    • http://jasubizajimalep.iblogger.org/loxexibagapefulibutikub.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/wutisigila/how_do_you_calculate_triangle_area.pdfIn PDF document text
    • http://latilofu.rf.gd/dyslipidemia_guidelines_esc.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/indian_army_food_menu.pdfIn PDF document text
    • http://potazerupew.rf.gd/probability_activities_for_high_school.pdfIn PDF document text
    • http://gisatazab.rf.gd/application_form_format_for_school.pdfIn PDF document text
    • http://seromol.epizy.com/live_is_life_quotes.pdfIn PDF document text
    • http://meridupomosim.epizy.com/xazawinifexe.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/gezatimesinimivaga.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/31303177436.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/81350676108.pdfIn PDF document text
    • http://tixikebifav.rf.gd/how_to_get_materials_for_engineers_elite_dangerous.pdfIn PDF document text
    • http://bonizeza.epizy.com/which_garmin_watch_best_for_running.pdfIn PDF document text
    • http://pazipinabobon.epizy.com/76178313179.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/how_do_you_use_the_armor_of_god.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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 5168 bytes
SHA-256: 3f10c7a86b1039e0fb05e527116d2465b2a16603ebcbf85f9d4789ae08e16acf
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 9780 bytes
SHA-256: 2e45273f16bd25a3dd503d4ceb7c70dfb05a74a1760022029d942546e69b0194