Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db36957836e9f99…

MALICIOUS

PDF

84.4 KB Created: 2021-04-06 12:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0dcad204995bcc7e159d54cbaeb006cf SHA-1: a4fdb1d4a5c0afb9da66428d2fccf09524bc53b8 SHA-256: 9db36957836e9f99d8f8346749aedee13d245a9e763bea3c17044e0803c8b485
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external URIs, with one prominent URL being `https://resalured.ru/123?utm_term=employee+schedule+blank+template`, suggesting a lure related to employee schedules. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://resalured.ru/123?utm_term=employee+schedule+blank+template PDF link annotation
    • http://momsmall.space/abbe_refractometer_working_principlei30n1.pdfIn PDF document text
    • http://saforanewasodu.22web.org/18367011581.pdfIn PDF document text
    • http://borolepejawodur.22web.org/vozakifufiwariwaweloxit.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/42903272034.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/5th_grade_math_teks.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/calendario_escolar_2020_sep_2020.pdfIn PDF document text
    • http://naturebiolog.space/ruriladuxorenefeni0ij2h.pdfIn PDF document text
    • http://zizuvajutenuvun.22web.org/graco_duetsoothe_swing_and_rocker_recall.pdfIn PDF document text
    • http://kmikaerfs.ru/omega_juicer_parts_australiajptf8.pdfIn PDF document text
    • http://femaxewife.getenjoyment.net/bolzano_weierstrass_theorem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4119e0-c646-40e4-8a7c-f93349a18bb5/27303679178.pdfIn PDF document text
    • http://tixixumusugik.rf.gd/letavitotefavixabaxuxipe.pdfIn PDF document text
    • http://lexezov.rf.gd/72041913416.pdfIn PDF document text
    • http://rexawisoza.epizy.com/couples_therapy_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1681be-b1e1-493b-9e59-6a01f7fc6025/what_is_the_current_healthcare_system_in_the_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f44c259-eb21-4245-8a9a-38ceb019b9d4/the_warren_buffett_way_download.pdfIn PDF document text
    • http://paviremepofuvu.epizy.com/fundamental_beliefs_of_a_muslim.pdfIn PDF document text
    • http://meganisaniwo.rf.gd/zusab.pdfIn PDF document text
    • http://rezemuxosezew.epizy.com/23548119909.pdfIn PDF document text
    • http://wajifinome.epizy.com/l_italiano_all_universit_1_answers.pdfIn PDF document text
    • http://xivoganunew.rf.gd/35865689179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250b7fb0-3e51-41b5-a566-57979ab8333a/hunger_games_4-book_hardcover_box_set.pdfIn PDF document text
    • http://notixowazi.rf.gd/magazine_file_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f9b35b-a593-48ab-a13c-0031554efe01/zemuwuxokegilonale.pdfIn PDF document text
    • http://rusuxagek.rf.gd/23657892536.pdfIn PDF document text
    • http://merofis.epizy.com/mikanekizozer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 5480 bytes
SHA-256: d3ed18ab936211aedd67d7554611e5ddbbf1a93460a5be67999035cc9a624081
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 11124 bytes
SHA-256: 6482956889b6624b4c1d3b7f4b82bfade38418885bbac03afd0f5f27a7c8ea1a