Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5744444041ea06…

MALICIOUS

PDF

78.5 KB Created: 2021-05-01 20:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a31e1e03b733f8e28c2b0889bdb3590f SHA-1: 68eb913f3880823099bf17771671e24774d69768 SHA-256: de5744444041ea06eb35f2ac5316de96699e5dc63a12152c436a4080e855687a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('xezojetit.ru') that is likely part of a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+develop+intuition PDF link annotation
    • https://cdn.sqhk.co/bulunazi/ibggXhb/79333600738.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/vjehdMj/deckeleven_s_railroads_2_diesel.pdfIn PDF document text
    • http://resogizona.iblogger.org/how_are_hydrogen_bonds_formed_in_dna.pdfIn PDF document text
    • https://cdn.sqhk.co/wojinagimepu/OSWjfgi/minujevisatitijaxepuz.pdfIn PDF document text
    • http://pipvip.ru/rovepew75umu.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/jgjepMx/11789214107.pdfIn PDF document text
    • http://renawozalor.iblogger.org/lireworuzemebapabuwut.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/a1Ghjht/pretend_play_theme_park_doll_house_amusement_park.pdfIn PDF document text
    • http://lessonsonline.site/auto_chess_mobile_guide_strategyzw2go.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/37a7db5f-d48c-4b56-bd88-4f17d571daf0/casio_g-shock_g-steel_military_mens_radio_green_strap_watch.pdfIn PDF document text
    • http://panawokel.epizy.com/91384855867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e6500b-7ca2-41db-af74-1a18430a3921/timogelaxixasudorekeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64356720-3a42-4342-a1a7-3c6a42a6f5d3/rojumilakuwujegerovila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479e1a45-efff-46fc-8c80-562eef464c34/pidejima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f0827e-957b-48d6-b116-5dcf0450416d/georges_batailles_story_of_the_eye_2004_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df56030-50d6-42dc-b4f1-4b1ba3251c87/how_to_sew_a_dart_in_a_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cc7b92-70b8-4c20-88c3-37b6b14794f9/25464386191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2657a7-3ddd-45be-8940-977bc7b86c73/what_is_the_difference_between_simple_cycle_and_combined_cycle.pdfIn PDF document text
    • http://woxutubutofewev.rf.gd/64216274267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f69ecad-ffbb-4d2e-8301-e3483dcd69d0/excellence_resort_cancun_playa_mujeres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0a7d67-3f7c-4ddf-b92d-3ca5aa195d57/69042184333.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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 4580 bytes
SHA-256: 9093c0980f85ae7ba4e96db1936754c774581ab9608d1cb8d5deb4fd12d364b5
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10512 bytes
SHA-256: 9296986e44bf66f46d754d82391be2346b35c3dc8ed83596683e5bf3a059a2df

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