Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad390574796db523…

MALICIOUS

PDF

74.6 KB Created: 2021-05-23 10:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 180cd6f1126d1f740b5314d066c1fd2c SHA-1: 728666914f2f6d07fb8a6e5a0e1f8f3cdef96efe SHA-256: ad390574796db5233bd38b2441a55339f1a424abec8571f78b618ebee598cac8
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 0.9996

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://druttle.ru/strik?utm_term=cat+5e+cable+data+sheet PDF link annotation
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/buvededapanaso.pdfIn PDF document text
    • https://gebiralegesexi.weebly.com/uploads/1/3/0/8/130814020/vanis-zopelimikepax-wadeki.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/8015289.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/218946.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/8208261.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/672115.pdfIn PDF document text
    • https://wazepitufakox.weebly.com/uploads/1/3/4/7/134735855/jadosagisuxef-sanebafapesubek.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/gezetega/bpce_sa_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/nav_canada_aviation_weather_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc09b61-cbeb-4d95-9675-157d1f130a88/nuzon.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/kibamologupukobarevuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b436c2-dd5c-4cfe-be83-88120cb9f1c1/graco_pack_n_play_snuggle_suite_lx_mattress_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5253ed5-e36e-4179-8243-7e097d4f0f71/zedasepofenugujizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51af1cb6-5510-4295-bdb0-046226d7e72f/how_much_does_a_schwinn_spin_bike_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/28130112678.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/chemfax_limiting_reagent_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/sunbeam_turbo_steam_master_professional_iron.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/crash_bandicoot_ps1_rom_espaol_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400c16b2-d39f-43d9-9c1c-c6f2c584d7ae/vikele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e351ae2e-d48c-4e3e-b59e-a2772381a5d5/nomidijijupipoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75137248-bcd0-41c8-8c2b-c414112930a0/juzirisodilefavejanuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30557fcd-34af-4650-a4f2-cf757ccd50b7/fujitsu_s510_driver_windows_7.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_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 5100 bytes
SHA-256: d38076df669305aee4a6387a7eba46d376540dd18ca2d296331a1ce59bde6458
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 10744 bytes
SHA-256: b7bf6b367bd846e9b8f90d1d53cb5fddbe02603aefb886a77168e0c0c7439e89