Malicious PDF — malware analysis report

Static analysis result for SHA-256 3633528137d8267d…

MALICIOUS

PDF

95.0 KB Created: 2021-05-24 13:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: adabb6aae40fad15ad34c2f35d2cfe6a SHA-1: de88e380bb4fb6bdf3f0dc3705580f2292b4697e SHA-256: 3633528137d8267d56b591afd7dfa87f828082f79063e3b538ec833766216243
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 0.9982

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://jacksth.ru/strik?utm_term=lg+g7+thinq+price+in+bangladesh+2021 PDF link annotation
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/tevula_weterule_xedikupew_xozarobesib.pdfIn PDF document text
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/dazodamalerado_zadabisaw.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/tekezupojabitom.pdfIn PDF document text
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/d3d1ce.pdfIn PDF document text
    • https://zipawesijapa.weebly.com/uploads/1/3/4/4/134494223/e83e3055e5207.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/43d144cf5ec3af3.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/vusifi_letana.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/vanazodumawefe_pafozuwaji_busabagutot.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/7621063.pdfIn PDF document text
    • https://lupirolawa.weebly.com/uploads/1/3/1/4/131453436/5391994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/333796ec-d7c5-49d4-a736-89e7772e3a60/wordpress_admin_login_page_not_showing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85926e48-915a-4196-a79f-81ef73c71089/kanedixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e0dba1-e34e-460d-b006-764c0779f366/what_channel_is_the_blue_jackets_game_on_spectrum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e986c24a-9f4b-42fa-ac6c-392a23c39332/pizzeria_da_marco_menu_attleboro_ma.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/wezovarigiwaligorofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/magnavox_zv450mw8_remote_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/msi_970a_gaming_pro_carbon_bios_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/director_loan_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/susibexewefiwazasito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8b58ec-8f31-4cdb-8df9-90b0c90c217a/asp.net_core_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/certara_phoenix_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/dle_yaman_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de545a6-6a1a-4f0a-8ffe-2eff29afb8fa/nowesoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b27f77d-7e52-4d35-ad10-a15f360d21ba/wugovowodaterenotoziji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4523e986-79dc-41c9-b2a4-60ff099426cf/why_is_my_summer_baby_monitor_beeping.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 5628 bytes
SHA-256: 3a952872930b06ab83fb03582c0b6764b7d6ff5fc80131dbfb999b93decb838c
font_02_sfnt_off00013a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 10988 bytes
SHA-256: 18adb47b7a4fdfb7d503b59408e20df9f8df6090db42631679afdc857c8c872f
font_03_sfnt_off00015fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3