Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90fd7b7a74a12c0…

MALICIOUS

PDF

74.8 KB Created: 2021-02-28 12:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32fd110f503fd4778411bcb812f97d85 SHA-1: 5cf1541e61e01ae4be00dc1c5093d8fc1de192cd SHA-256: a90fd7b7a74a12c05f0f8dc14a6e520d1109d7fbe2ab71e915e86f6c8257e0cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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 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://mezovuduw.ru/123?utm_term=microsoft+excel+shortcut+keys+pdf+free+download PDF link annotation
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/7011242.pdfIn PDF document text
    • http://olx-delivery.cc/technicolor_tc8715d_firmwarez05qt.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/48c9d10.pdfIn PDF document text
    • http://the-glow.ru/conical_pendulum_experimentxb6b0.pdfIn PDF document text
    • http://naturaitalia.space/reformas_borbonicas_cchtqsq9.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/82584015989.pdfIn PDF document text
    • http://kupivse.xyz/weather_report_for_camlachie_ontariobkhp2.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/wisaz.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/voyager_legend_cs_b335_system_bluetooth_lat.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/pikonawogikizexo.pdfIn PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/daribozebunazixuju.pdfIn PDF document text
    • http://bankrot-biznes.ru/rivevubizitnjhj.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/google_cardboard_apk_android_4.4.2.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/remavuj/alto_s_adventure_apk_apkpure.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/char_broil_commercial_tru_infrared_4_burner_double_header.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/i_am_not_perfect_but_i_am_limited_edition_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/82613888451.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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 5572 bytes
SHA-256: e2761c64ae62c06e3c4ff97929d6aca2dac8c6c04ef0ec3a02b8e28198a3b8d9
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10948 bytes
SHA-256: 17ca979f71ef98dca33ce506107a90d757a090f915013ed1f1270405ff1b1a91