Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd48d358c42c3dc3…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 06:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4ec51424f9d89059149ea9a613b73858 SHA-1: 5a66c02136c124767d4ca968f2863431dd4fca26 SHA-256: fd48d358c42c3dc37af9b38d87f3a051e33c5bf83d958a75134d3497495a8032
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 numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct textual content that would indicate a specific lure. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=benzenoid+hydrocarbons+pdf PDF link annotation
    • http://sutovuresas.mygamesonline.org/educational_psychology_courses_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Boihejg/ninomezat.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/development_of_psychological_assessment_in_south_africa.pdfIn PDF document text
    • http://duxolaw.22web.org/dell_emc_poweredge_r840_spec_sheet.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/accountability_partner.pdfIn PDF document text
    • http://vamepabiresoriw.22web.org/81089817117.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/what_was_going_on_in_germany_in_1912.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/pictionary_words_easy.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/bhagavad_gita_chapter_1_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/Tibpidz/era_of_celestials_hack_diamond.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/f7eb9e4a-7909-46ce-bd2f-03ebf5d0d655/on_green_dolphin_street_lyrics_meaning.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_c4675381db7a4723809850d87b68dc23.pdf?index=trueIn PDF document text
    • http://dajasunekufa.epizy.com/numimuf.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/76917417201.pdfIn PDF document text
    • http://navezep.epizy.com/43703473074.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/the_economics_of_money_banking_and_financial_markets_11th_edition_powerpoint_slides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e441965-91f3-4cdd-8871-9810e8e1f2d8/bonebudef.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_06b135b7e0064c8e9556adab87d921d4.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_5c32edcfc6b0474eb4309d3c9b3ddde7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5552 bytes
SHA-256: 02d6a21aa090c5df1cb27a3f9aab15f1643f49ea87df319d77eb279d7d9f39db
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 11524 bytes
SHA-256: 6e3a6e5f3f4d117e72cee87361214fea6bf6b589b45951d894701c67d077f0c6
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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