Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dc2fb65477403f…

MALICIOUS

PDF

71.9 KB Created: 2021-03-04 07:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 63f92d3dd255dc655f180849d84b0340 SHA-1: c047e953d4807abf8ecc920ece035e38df953b37 SHA-256: f1dc2fb65477403ff406dbda2ceba7f21b5009a8a474cb42a4cbb473eeb97f65
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=mass+rmv+7d+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5fd24fef199e0.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/lifJbgh/4604592974.pdfIn PDF document text
    • http://natur-green.fun/duvaxutuvadurizowevimi43bud.pdfIn PDF document text
    • http://wirelessinfo.ru/968525662466e5lf.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/17151156314buufa.pdfIn PDF document text
    • https://cdn.sqhk.co/nejijilo/mN9Tiak/wakurubiwazugufupejarew.pdfIn PDF document text
    • http://zespodsvetkoy.site/simplenote_mac_os_xqiwl6.pdfIn PDF document text
    • https://cdn.sqhk.co/rijujonakuje/ge8w1BJ/darkestville_castle_ps4_trophies.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/g0NjgAI/fall_menu_items.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/hp_easy_scan_not_working_mac_high_sierra.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/cigiqzH/new_movie_premieres_today_on_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/lorakerasima/jiqgigF/american_dad_apocalypse_soon_hack_no_human_verification.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/gjM1s94/z_nation_season_5_episode_10_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/yWRjcgj/40630944088.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/c3nBibG/time_traveler_s_wife_sequel.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/91336972301.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/spring_framework_reference_5.1.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/a_song_of_ice_and_fire_book_set_ebay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 5116 bytes
SHA-256: d72cd90e3a0386fbe8cf20816c83af092fcfc4ebb4a048d2e9b5c2d48bb112c1
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10968 bytes
SHA-256: d7647eabf9dd34626e246616dff131129557aee58be2c9050652b8397bb05282

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