Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c37e070fc88cc0b…

MALICIOUS

PDF

76.2 KB Created: 2021-06-08 12:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 702779a81fc93f4dc9e6770fac3a64d7 SHA-1: 558d10b451e0c1fad03fa1253dee2ad7ff042a5e SHA-256: 4c37e070fc88cc0b743614f2cea3365b3fbe86c32fc5e04d26ddfa4ff3533687
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 0.9990

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://crysiq.ru/pbw?utm_term=inmunologia+abbas+9+edicion+pdf+descargar+gratis PDF link annotation
    • https://wisemidotoveto.weebly.com/uploads/1/3/4/3/134349295/jowavetes-momuki.pdfIn PDF document text
    • https://ranepudanaliv.weebly.com/uploads/1/3/4/0/134000181/2651980.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/1af3e5079d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5ff168b470714.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/favabajelewubutid.pdfIn PDF document text
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/d222079348e.pdfIn PDF document text
    • https://xeluluferira.weebly.com/uploads/1/3/4/2/134266649/sosadenofaj-nufewuru.pdfIn PDF document text
    • https://vinusipiwa.weebly.com/uploads/1/3/1/3/131381721/107247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_60324f43daeec.pdfIn PDF document text
    • https://walamemagiro.weebly.com/uploads/1/3/4/4/134441064/da6b7d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_6024f25dc6c47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://papoxuva.pbworks.com/f/gawileridipuneva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25881a96-d724-4e15-a55d-3015b95596b3/graco_solano_4-in-1_convertible_crib_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5434399-c32f-4091-89e3-f5b5c1294b43/2047414619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654e3a27-895e-4b16-8d20-10dc2b4e9ec3/bakekixorusapuzapatasiluz.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144504621/how_to_make_money_off_cash_app.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/kamyab_jawan_program_sme_form_download.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/ruh_sal_ve_davran_bozukluklar.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/gta_san_andreas_hileleri_gemi_hilesi.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144427104/planet_earth_caves_47_minutes_2007_worksheet_answers_key.pdfIn PDF document text
    • http://mejigulo.pbworks.com/f/zikitakedug.pdfIn PDF document text
    • http://labidan.pbworks.com/w/file/fetch/144479421/simplify_rational_expressions_in_math.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/f/block_launcher_pro_for_minecraft_1.14.60_download.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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 5708 bytes
SHA-256: 55ff0f3173412a5a2e8f74bf1ceb9712460b1b98de619fd5d4c84d6cb5801ccc
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 12176 bytes
SHA-256: 026878a6458335f0860593aa3b73581a7dbf8da85c4583d7803bb0e6e657819e
font_02_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3