Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f555631ab72369b…

MALICIOUS

PDF

82.4 KB Created: 2021-03-09 06:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1de68cba5525b52223538fb8ed56111 SHA-1: 5a620ae599f0fff0fc97029aa1ec15758027f262 SHA-256: 9f555631ab72369b09919eb77a3e2023689cc6e9589f5a2c34d2a356dea1d49f
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://seumenha.ru/wix?keyword=njrotc+leadership+academy+area+6 PDF link annotation
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/sudatoxiwadenel.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/60daa9f0cea9c.pdfIn PDF document text
    • https://cdn.sqhk.co/baradudapati/k2lgdji/63536602152.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/rekojebaso.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/1487120.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/aichajj/bloons_td_6_hacked_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/Uigghi3/jarapu.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/rakozobaloxibij_nedinetixis_fikesosu_xepil.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/xilenidudimopi.pdfIn PDF document text
    • https://bososotozakep.weebly.com/uploads/1/3/1/4/131437593/kigij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_e30138aeccc0446e9a1a45986f181b5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/nielsen_report.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_1aaa85e04956466ca47fec172e11deee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/local_guide_level_10_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/list_of_monsters_by_challenge_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/albany_white_bread_nutritional_information.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_305ce5c84483426d903b716c93d889fa.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_248d440365e2445698c2da572f0c4434.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/89906205384.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_fba20cc8aa46450aa56c2a606954edec.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_722b123ac59147ba944468f39ff2d857.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_6cc29bcaebd64ca3b6963f3eff964d5e.pdf?index=trueIn 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_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 5616 bytes
SHA-256: a7008f764e0b1cda95e212d61f3c03df0d532cfd6534e57f2b53d7515c23ebc4
font_01_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 10240 bytes
SHA-256: bc1960f7c108f26fe26a11b8dd44b4f5471e48d3222194cc4b8469bd3583daf3