Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ae9a7a7f69e9dd…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 06:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 51ba9a33711efb866e3f430161b4deff SHA-1: 55152aec89d89302fd47ae2163e3d4db7fa80485 SHA-256: 53ae9a7a7f69e9dddecacb19efd151b0a962323de622c60ab4fdbd0c83de2767
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. The primary external URL observed is golowaki.ru, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=cs+lewis+cristianismo+puro+e+simples+pdf PDF link annotation
    • http://masonufidowex.iblogger.org/90885074021.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/kubota_v1505_diesel_engine_for_sale.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/fukawoleku-lanapogokejod.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/wanopuwitakusivig.pdfIn PDF document text
    • https://zabagogaj.weebly.com/uploads/1/3/5/3/135313674/4358175.pdfIn PDF document text
    • https://gamunodeda.weebly.com/uploads/1/3/4/7/134765824/suwuvagolezu-zimusudewara-kidajob.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/melulara.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/lodazojamuva/how_to_use_braun_thermometer_baby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6f2b68-b32f-48b6-8b8b-6da94b93bad8/tasezapilokised.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/bop_it_2020_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/free_live_tv_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/wedizuseruduzamulesofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7803834-b063-4bd3-92eb-d392792abae1/51844458707.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/optiplex_gx620_cpu_cooler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9d3003-c7e7-4848-8624-161e885c40be/21772341874.pdfIn PDF document text
    • http://mifumupesa.rf.gd/fizulepopamokademopoje.pdfIn PDF document text
    • http://budibisila.epizy.com/dexogod.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/76487875067.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/grand_gangster_game_for_android_mobile.pdfIn PDF document text
    • http://topajikof.epizy.com/desmume_nds_emulator_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25fb4b5-4c4d-484e-8e06-380451d4c5f6/how_do_i_track_dhl_global_mail.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/sedra_smith_microelectronic_circuits_7th_edition_solutions.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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 5296 bytes
SHA-256: 32081e20bc0de67745323b90119050390cc27672494db326daebf58a93702d80
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 14584 bytes
SHA-256: e34dbb41674d63a659b202d93ef316a22db81a3aeb64a5706dabd5965a198dfb

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