Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e71d660851fb5e…

MALICIOUS

PDF

85.6 KB Created: 2021-04-03 00:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f195e1efd8be6f19d1e8911db846696 SHA-1: 11ee77ed25b80dc44371de96857db413b8fe790c SHA-256: b7e71d660851fb5ef48398516cf74d7870c044b57722a539aa7e040ea405d6fb
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 0.9994

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://seumenha.ru/award?keyword=absorcion+intestinal+deficiente+pdf PDF link annotation
    • https://gimalijuvilonur.weebly.com/uploads/1/3/4/6/134619020/pulujemuda.pdfIn PDF document text
    • https://cdn.sqhk.co/wifuponi/hqKCZq5/synthesis_of_esters_lab_answers.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/58812273319.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/6izMjaw/super_mechs_wiki.pdfIn PDF document text
    • https://mugunerer.weebly.com/uploads/1/3/4/4/134479547/lukoxasugaloxu_laxavazo_ligomiru.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/dzie2km/21586138162.pdfIn PDF document text
    • https://vovepelit.weebly.com/uploads/1/3/5/3/135325097/pekoketur_zilag_pelunaziv.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/hhbhigg/98393652604.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxegejedak/ifDjjje/ikea_desk_with_drawers_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/Lgdjbhh/war_robots_gold_hack_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/Y6ggsjb/7661139015.pdfIn PDF document text
    • http://qunit.space/tawafebexolafoxiteremuba4i0t.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/23701169281.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/jwJeWjb/dinner_invitation_template_word_document.pdfIn PDF document text
    • http://omynutural.space/bach_trumpet_mouthpiece_chartzp03u.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/nagasawuxekegin5s9v7.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/fijizixivaraziloti.pdfIn PDF document text
    • http://winoorama.website/88972246538s0c0z.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/jdgihbJ/nasa_news_sun_will_not_rise.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/hjgfteC/97127021738.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwosagamivi.myartsonline.com/how_to_get_the_true_ending_in_sao_fatal_bullet.pdfIn PDF document text
    • http://nitubak.atwebpages.com/985997306.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_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 2104 bytes
SHA-256: 6035ca2896085c66ae4be707d9c0026749e7a5ec9ab79e9b71e5af6db927cb40
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 5276 bytes
SHA-256: c16dc4e455846497c6a50e2f35a0121dc7680068ad5afcf676fd7e7ddbfd7521
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 12548 bytes
SHA-256: 61404cf401c357ed7ac7a12a14546aa1e58863945715feabc3fc304b6c87da8b