Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb81b4708654077d…

MALICIOUS

PDF

105.5 KB Created: 2021-02-28 02:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d470b8a1ccd34f8dab50d56824659d32 SHA-1: ae4a56864c28db11f6b3db8e4fc7e9ecdaad1461 SHA-256: fb81b4708654077dca5cfd2057d67e572c4b904a5dd83508414136a2262b488d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of external URIs and the link farm nature strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/award?keyword=what+is+definition+of+full+service+public+relations+consultancy PDF link annotation
    • http://lojapidabud.mypressonline.com/welcome_to_shadowhunter_academy_books_in_order.pdfIn PDF document text
    • https://witaretazijaw.weebly.com/uploads/1/3/0/8/130813730/1189934.pdfIn PDF document text
    • http://fastpysystem.online/ps4_emulator_download_pc_version_3._2._13cpt8.pdfIn PDF document text
    • https://lexifodupep.weebly.com/uploads/1/3/2/7/132712330/fijivawewif_gufim_jomedogemomo.pdfIn PDF document text
    • http://healsmall.space/fetebubu64qom.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/1470617.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/c7c5662c.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/runidupedalanevikov.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/kavidano.pdfIn PDF document text
    • https://kurixaxewa.weebly.com/uploads/1/3/1/3/131383664/9043703.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/93fd8a1.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/18580948713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekiwuja.rf.gd/22734604480.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/adios_nonino_cello_sheet_music.pdfIn PDF document text
    • http://fidazel.epizy.com/birds_imagine_dragons_sheet_music.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/85748806871.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/fepavurirolazigiw.pdfIn PDF document text
    • http://datonojafasaxup.rf.gd/android_sdk_adb_device_unauthorized.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/mifulevataxupunore.pdfIn PDF document text
    • http://wusekugu.rf.gd/rozufuvuxolod.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/pdIn 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_off000161b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B5 5560 bytes
SHA-256: bdbe831938d8afcd51132782ffbb2441726367a9754e6a266a3af3045d20df54
font_01_sfnt_off000174aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AA 11264 bytes
SHA-256: c26cacceb2e27efabe6de29efadbe9ed7fb8483234ebac657ed0e7706a4da2d6

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