Malicious PDF — malware analysis report

Static analysis result for SHA-256 537989c3b2e4d358…

MALICIOUS

PDF

75.7 KB Created: 2021-04-26 13:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 79ecddeb0da9fe9da13f750521594779 SHA-1: d4e55e16c592075aae602ba8c6606f3e50ed8334 SHA-256: 537989c3b2e4d3580dc8e58c675450ef22c476522a96d5a0b2978bc10e9d736d
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, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. One prominent URL, 'https://zajinet.ru/strik?utm_term=garmin+vivofit+junior+3+black+panther', appears to be a lure, potentially leading to a phishing page or malware download. The presence of external URIs and the link farm heuristic indicate a deliberate attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=garmin+vivofit+junior+3+black+panther PDF link annotation
    • http://pozijuza.scienceontheweb.net/uglies_book_series_review.pdfIn PDF document text
    • http://everydays.space/78834119747cekly.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/hficlgi/warframe_market_riven.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/extreme_ap_7522.pdfIn PDF document text
    • http://galoomer.online/mepidebipoditajowisutaxor667n6.pdfIn PDF document text
    • http://opsnatur.fun/35211681970xxo8y.pdfIn PDF document text
    • http://ejqy.com/xedijupaxowemavigoxoroxojvo5l1.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/bose_companion_2_iii_watts.pdfIn PDF document text
    • http://mifvideo.space/the_developing_person_through_the_lifespan_11th_edition_free3nb0o.pdfIn PDF document text
    • http://1ux.site/accu-chek_aviva_plus_blood_glucose_monitoring_system_reviews9926n.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/ezjaIja/carrom_3d_game_for_pc_free_download.pdfIn PDF document text
    • http://redit.fun/6679250089693pvr.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/idnjhcJ/pejirawebalagalelew.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/4142194191.pdfIn PDF document text
    • http://vatamuvemazaril.sportsontheweb.net/43212607679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juludiripo.myartsonline.com/25142461865.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/zojobufo.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • http://tisavan.onlinewebshop.net/calculus_on_manifolds_munkres.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/88890795398.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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 5612 bytes
SHA-256: f44a89a629f4f277dc699a8eec93900825c288185bfedf5aa204e4879b747469
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 12684 bytes
SHA-256: 0640104d6bccfb7c0273130d3e6510b41e3171daa13b99bab3fd3c5cfa028ab2

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