Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54f6595c3da6f94…

MALICIOUS

PDF

93.7 KB Created: 2021-03-14 14:34:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aacf1df4a8292a86abced2c664be914b SHA-1: 44e04997d03f5bce28da9729511ceff0e2a2dfef SHA-256: f54f6595c3da6f940f4ae9d0aa92ae4bf697041de6e397b9e3206d1f962ee8a0
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 trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, and one prominent URL with a 'utm_term' parameter suggesting a phishing lure. The document body, though heavily obfuscated, contains text related to 'inference question' and 'wkhtmltopdf', indicating a potential attempt to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jacksth.ru/strik?utm_term=what+is+the+inference+question+and+give+the+example PDF link annotation
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/madavajutamov.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/4721908339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fe78bd0b44b9.pdfIn PDF document text
    • http://surerup.22web.org/password_manager_open_source_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426832/normal_5fee6c96c379a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6011a102753b8.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/3c2ad03da5113.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/how_to_become_good_at_drawing_fast.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/megabilojusomat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_602dfaab9f4f5.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/389ad5d8e9.pdfIn PDF document text
    • https://guparamoribum.weebly.com/uploads/1/3/2/7/132711937/wifizimebijolu.pdfIn PDF document text
    • http://rabusasomel.22web.org/shrink_mac_os.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdf3be2a6b75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorujuzolu.epizy.com/puzevisitupopanosun.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/old_christian_english_songs_free.pdfIn PDF document text
    • http://xakafoboveje.rf.gd/ketokilelogilomomad.pdfIn PDF document text
    • http://gogaretafibofo.rf.gd/impedance_matching_transformer.pdfIn PDF document text
    • http://libafal.epizy.com/womufusimutamejitus.pdfIn PDF document text
    • http://vubimefiz.epizy.com/raise_a_hallelujah_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/ocarina_of_time_switch_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/free_ms_word_invoice_template_s.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/introductory_mathematical_analysis_12th_edition.pdfIn PDF document text
    • http://jexamovofu.epizy.com/ashampoo_burning_studio_19_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/chetek_wi_fishing_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/amla_tree_information.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_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 5836 bytes
SHA-256: 842fae71ea3e58ca6391a593ce1811b525e9c02537a8f7749c69608d25df6643
font_01_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 11732 bytes
SHA-256: 4a9e0a56ca46e6cabe39ac25172f851ee33b26f7935212841679b34d346fff63

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