Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e559e8865e9feea…

MALICIOUS

PDF

77.3 KB Created: 2021-02-06 18:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be053c3efbcd69abd081d42709009ce3 SHA-1: cf1a3f7cc8bffd23fa466df35b12fd69d94c6a0d SHA-256: 3e559e8865e9feea173821272a301903b7cbf6090db5ef49ac2c35b92edd87c9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malware or phish users. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest this malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=delonghi+coffee+machine+manual+dedica In PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/3b37a23.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/8592186.pdfIn PDF document text
    • https://sipizoreju.weebly.com/uploads/1/3/4/1/134131451/d35c59.pdfIn PDF document text
    • http://spindlndou.space/masha_e_urso_portugues_portugalkl4ys.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/lelemame.pdfIn PDF document text
    • http://gupupokuvugal.22web.org/angular_5_form_set_dirty.pdfIn PDF document text
    • https://terifebi.weebly.com/uploads/1/3/2/8/132815785/jepotasefumul.pdfIn PDF document text
    • http://1cats.space/11th_step_nightly_reviewu2uge.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/5970229.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/vuruzemudu-levesuse.pdfIn PDF document text
    • http://genusadnlo.space/xeluxalokatabexorewaxexi0pdsy.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/5fb51c1360b.pdfIn PDF document text
    • http://greenbike.shop/excursiones_cruceros_por_libre_opinionesvpgdi.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://s3.amazonaws.com/liwafo/binogadivofubawudenisagu.pdfIn PDF document text
    • http://mamotupot.rf.gd/pokemon_fire_red_mega_stone_cheat.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/26467348680.pdfIn PDF document text
    • http://lobovofuni.epizy.com/hide_navigation_bar_android_9_pixel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 4964 bytes
SHA-256: b249c04e26ada79b6a08ea0d3489a8fc6964ed1727312a2c44ba3a62eeceb6de
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10432 bytes
SHA-256: abb48c1cf46927e91be464b1c280288093c46fb93dcd19f42d97ad3246e2650d
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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