Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a93b077b7e2d926…

MALICIOUS

PDF

97.6 KB Created: 2021-04-09 21:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00730fd7e030ac846ec357266709f735 SHA-1: 93bd06eedd76aaed2452b0c715f75bd634c428d1 SHA-256: 7a93b077b7e2d926b9d62dbe4cbd7f872994c3851bff26b30cae94690fb2202e
186 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 0.9970

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=brinkmann+electric+smoker+recipes+turkey PDF link annotation
    • https://jawuzomave.weebly.com/uploads/1/3/4/6/134660074/6802638.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/7N4Vhby/xominagolexa.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/jfhiNjd/nikusudid.pdfIn PDF document text
    • http://blue-tick-central.com/basic_programming_commands6j25g.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/canciones_infantiles.pdfIn PDF document text
    • http://viewcreditscore.info/molame66m9z.pdfIn PDF document text
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/rujubozanu-bixatan.pdfIn PDF document text
    • https://xuposebifaperep.weebly.com/uploads/1/3/4/6/134673232/kitafosanafirafelo.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/ie2Libs/last_minute_hotel_bookings_london.pdfIn PDF document text
    • http://interbankdigital.com/34679114135o6snj.pdfIn PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/cf3ce7396b.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/korunoga-denifivaligazo-bopegogut.pdfIn PDF document text
    • http://creditscorehelp.info/free_avi_to_mp4_converter1lakf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_148d8f7a3a224407bbcd23a3f640d74e.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_f8ffd31f87f946deb0992039440901a4.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_b9da5c283c4d4d59ae155f19dce40469.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/leniraputesujosat.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/tabla_de_conversion_de_medidas_pulgadas_a_centimetros.pdfIn PDF document text
    • http://tosipasakuvil.myartsonline.com/toro_lawn_mower_repair_service.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/vocabulary_for_ielts_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/north_carolina_drivers_license_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/configurazione_alice_mail_imap_android.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_36aac411c3be4ed2a2817bfa191c20d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/is_cycleops_fluid_2_a_smart_trainer.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_05fdb3bab60a4b0c9a290e0b75458790.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/aggiornamento_firmware_tascam_dr-05.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_off00013fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA6 5292 bytes
SHA-256: 2234bff34cef9dc98d49c9a47cc3f9b207e176a4dce8228a8343ddf01ff157ea
font_01_sfnt_off00015198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15198 11596 bytes
SHA-256: c0d0a2a91f62dea86ef4917571da0a3bc0ac97e205be61a443a23652f1625b9a