Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0e7ee2e12258ce…

MALICIOUS

PDF

97.2 KB Created: 2021-06-13 17:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0420cffdf15e0d6646d1c060127a13c8 SHA-1: c327fdf671e50dd35c8f0d0580e6b5c6cd750d36 SHA-256: db0e7ee2e12258ceeb9db6892b95ce5727d82d089e3f26cc455b639928db048f
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 0.9946

Heuristics 6

  • 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 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://infrive.ru/pbw?utm_term=fish+zole+for+bv PDF link annotation
    • https://xupatoxavivuni.weebly.com/uploads/1/3/4/6/134615471/riposu-bigezelesapo-ruzojok-lubefiraxajib.pdfIn PDF document text
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/1900945.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/5579985.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/lolotikomowejefuga.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/5214586.pdfIn PDF document text
    • https://vadurijale.weebly.com/uploads/1/3/4/5/134590900/2095718.pdfIn PDF document text
    • https://zujogomute.weebly.com/uploads/1/3/1/4/131483029/nadepofomefum-mosozup-bobijixuki-sigeged.pdfIn PDF document text
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/vetugoz.pdfIn PDF document text
    • https://kinumefiboposif.weebly.com/uploads/1/3/4/8/134865532/penoxojizujujo.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/0c11a64.pdfIn PDF document text
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/bosewazifalapelili.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/kodebu.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/803926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixugigir.pbworks.com/f/will_backlight_bleed_go_away.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7f2faf-62f7-4ed8-a30b-a769b82924ba/mass_of_christ_the_savior_glory_to_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266cc281-fe19-4d5a-bdbe-bef2e836cced/remington_electric_chainsaw_bar_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a7c830-0434-4781-83b0-39e2ae22ddf2/nilewubilomudakoguni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500a4237-7c24-4f48-90bc-5a0b277c2313/gobadevavimo.pdfIn PDF document text
    • http://lovixov.pbworks.com/w/file/fetch/144826464/differential_calculus_by_ricardo_asin.pdfIn PDF document text
    • http://nutafojijoki.pbworks.com/f/what_is_the_name_of_judaism_holy_book.pdfIn PDF document text
    • http://tujedet.pbworks.com/f/uncharted_4_ppsspp_download_for_android.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144451566/pradhan_mantri_awas_yojana_pune_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22096b5a-b3a8-4a2f-bcfa-ecd391ab61d4/9422606543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598793b7-10d3-4141-8498-477008a79931/why_do_i_have_no_dial_tone_on_my_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adcc318b-d341-47b4-b703-a3a92743b113/the_fall_of_the_house_of_usher_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23d651e-fdd3-4290-b6ff-5db789627d3f/kawasaki_fh580v_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74e9cd9-8d32-4318-91ff-aff812b1c1d4/powunadoxarafulabosiwud.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_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 4852 bytes
SHA-256: 2a6f13fd2cc936ccf683e546a96051efed436b8162aac79305349d78ea11dc41
font_01_sfnt_off00013764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 12048 bytes
SHA-256: de37219a32e71474392aa8089525515ab7f109e47c05c0816df6d681ba42c142
font_02_sfnt_off00016003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16003 16232 bytes
SHA-256: ffd3e8dfc560eb94389583fe820f5cf566e1aa0306485e7a124c5ca1b60505e8