Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2f4a595d7a4124…

MALICIOUS

PDF

75.6 KB Created: 2021-03-23 21:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2081ef6d7415f5109026adecf9022a6d SHA-1: a22bf686a40a3e04b2f4d4164b3b768d7bca96c3 SHA-256: 2f2f4a595d7a4124060d669ca4cf7391734ed46424b1f0179d7722c4203b7ad9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to unit conversion and references wkhtmltopdf, potentially as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=como+convertir+grados+a+pulgadas PDF link annotation
    • https://cdn.sqhk.co/xidizizo/fhjhcjh/saaho_naa_video_songs_mp4.pdfIn PDF document text
    • http://kernig.store/chatal_band_mp3_song_free_downloadiyjbk.pdfIn PDF document text
    • http://nozatisesufi.scienceontheweb.net/79184809160.pdfIn PDF document text
    • http://siankaanmexico.com/pamigumetaxelewn0r6a.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/1Eid1gf/flow_free_bridges_sampler_7x7_level_12.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/iihiRo5/wifi_calling_lycamobile_pl.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/ehfiCV8/best_store_to_buy_craft_beer_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/evKjbbF/lipufedose.pdfIn PDF document text
    • http://unityfree.xyz/oxford_duden_german_english_dictionary4nmzz.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/ih3gcC0/20020971359.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/28943992314.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/anlodipino_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/ieAPlea/niwisonurimarudazex.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/junovafojene.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/iPhfdLu/dunk_shot_basketball_game.pdfIn PDF document text
    • http://obmenkalnr.online/rts_program_2020uhvn0.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/gjLDnjf/youtube_tv_customer_service_call.pdfIn PDF document text
    • http://nubolats.xyz/gerifibuv21og.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hhjjahb/bugomevekubibimurabezi.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/oc5gcge/walmart_moneygram_hours_on_saturday.pdfIn PDF document text
    • https://cdn.sqhk.co/toledexipez/YhahfwO/84844107379.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/Jifa2qk/jubekugabixesi.pdfIn PDF document text
    • http://palopepidek.mypressonline.com/the_story_of_the_human_body_chapter_summary.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
    • 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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 5356 bytes
SHA-256: 6b0f41cf49b03b62e4715ad48cb934babcc014c7f54de937e738487ac9f8c81b
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 9732 bytes
SHA-256: a6d508c004635b72de5730cd537273495320238c35d51200147ed8ddeacf1256
font_02_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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