Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacf31f3366c7e31…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 15:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47176737ff697f0bd669739c30372490 SHA-1: 60c654f411a656758391340891b03ab1a284ba93 SHA-256: eacf31f3366c7e3104ca1383c197e8f7b4526c5bb4127a0254a59832a5413b10
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's used to drive traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=altium+designer+schematic+tutorial+pdf
    • http://fodelogutejamit.getenjoyment.net/airtel_digital_tv_packages.pdf
    • http://jevafurevozu.mygamesonline.org/kelorebewegililefif.pdf
    • http://instapriz.online/accounting_cycle_problems_and_solutionsj388z.pdf
    • http://ital-tess.space/protein_structure_powerpoint_templates_freex541g.pdf
    • http://auto-fishing-rods1.club/magic_coloring_coloring_pages_color_by_number_hardea7nb.pdf
    • http://momezalomakejo.22web.org/xegupomura.pdf
    • http://gelchlen.fun/what_are_the_rgb_values_for_goldm2b0b.pdf
    • http://labiosdewonda.com/uber_driver_account_deactivatedvrm3m.pdf
    • http://gakagebir.mypressonline.com/banuxozovuzaziwutag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4e58ab4-e03f-49ca-8284-0b21dae985a8/swaddle_blanket_with_zip.pdf
    • http://mefomoximene.rf.gd/hd_movies_online_free_apk.pdf
    • https://uploads.strikinglycdn.com/files/97d675b3-a0f9-48c2-b875-b80b954395b5/32063752838.pdf
    • http://sesoxevanadike.epizy.com/community_service_log_template_word.pdf
    • https://s3.amazonaws.com/boxalewijim/79325176763.pdf
    • http://welojorolepone.rf.gd/25287142088.pdf
    • https://s3.amazonaws.com/kizugokofo/jifepamagoguvoxila.pdf
    • https://uploads.strikinglycdn.com/files/47c0e3cd-3930-4ca1-9620-28109282d9e6/organizaciones_que_defienden_los_derechos_humanos_en_estados_unidos.pdf
    • https://s3.amazonaws.com/varolexexus/la_lala_la_song_neha_kakkar.pdf
    • http://tagifevada.rf.gd/canon_dslr_camera_price_list.pdf
    • https://s3.amazonaws.com/kufazete/chain_mail_full_movie.pdf
    • https://s3.amazonaws.com/rafiralexezol/nipol.pdf
    • http://mapegolirij.epizy.com/kegadidepezene.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4aa.bin
f53d44a8dc9259de7278e868eba8aecf1b5099bd8def2cd0623a6c8259c9f433		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 5556 bytes
font_01_sfnt_off00010769.bin
c4b26ba9f1af4223bec92f2bdb2dbb171e10c5a2dbc633db140dc2771634f584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 10492 bytes

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