Malicious PDF — malware analysis report

Static analysis result for SHA-256 091ccc11fc190c7f…

MALICIOUS

PDF

67.7 KB Created: 2021-03-06 15:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5bb4d9a4205484950f926b971056cd30 SHA-1: 5c431635b8b20d1165269c16c62d2f5db964c4ae SHA-256: 091ccc11fc190c7fe53d2b7e9dc752cac09dfbce1ac9520e43e14cb0c63db614
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent by using multiple domains and UTM parameters. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

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://midufefew.ru/aws?utm_term=core+phonics+survey+spanish PDF link annotation
    • http://bumaga.bz/ridgid_12_inch_sliding_miter_saw_reviewsc7bw.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/GDsiejh/1550325658.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/9a54Yhf/wifeleg.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ngiqWtM/line_up_draw_the_criminal.pdfIn PDF document text
    • http://savadaqwe.space/jadefxuubq.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/aLMjtgc/rufuturaxarez.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/Aijqjbh/wepas.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/fig5sib/jezunezibupam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/ghost_in_the_machine_police_t_shirt.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/arlington_va_hotel_tax_exempt_form.pdfIn PDF document text
    • http://bilunet.rf.gd/dopatixovim.pdfIn PDF document text
    • http://fezaxakanopejux.epizy.com/vutulijukisilavuziw.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/jolly_phonics_tricky_words_list.pdfIn PDF document text
    • http://zaxalamel.rf.gd/52548036033.pdfIn PDF document text
    • http://sozofini.epizy.com/fotadet.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/66298096539.pdfIn PDF document text
    • http://modunatotuw.epizy.com/percentage_increase_decrease_word_problems_worksheet.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_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 5056 bytes
SHA-256: cd096d042d558b8724d3408dd43df12720f7e73198aed92f33991bf01bce4ae7
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 10708 bytes
SHA-256: 3287552158ccd17a19d45640a2b57e67116ffc96df686cde6a8225eb3f8fad05

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