Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe71b6340216f102…

MALICIOUS

PDF

80.7 KB Created: 2021-02-16 19:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a8c748cd3f0ccca5e3bb6f3beec91f6e SHA-1: fb6aad6bbe8229fae3f17b7de39cadb7c05bbe5d SHA-256: fe71b6340216f10299c1deccdacb44427c1d670d6ec1944bb0fddc596bce61b7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL appearing to be a lure disguised as a search result. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, common in phishing and scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=node+js+design+patterns+github PDF link annotation
    • http://zupurowuzuxule.iblogger.org/34018780793.pdfIn PDF document text
    • http://samyog.ru/zurunixepafovotakuuyeze.pdfIn PDF document text
    • https://domaruvujus.weebly.com/uploads/1/3/2/6/132683142/kitadejevur.pdfIn PDF document text
    • https://wodokapiv.weebly.com/uploads/1/3/4/5/134584818/suxikivarexirob.pdfIn PDF document text
    • http://movoxazukum.22web.org/best_free_anime_streaming_app_android.pdfIn PDF document text
    • http://qunit.space/ribabuxamobawiwadusaxedeodus.pdfIn PDF document text
    • http://igcopyrightforhelps.com/bombsquad_apk_mod_file0r251.pdfIn PDF document text
    • http://info-pages.ru/elinchrom_d-lite_rx_4_4_to_go3z41r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezogaxexinaga.rf.gd/jimefazivimipidifugo.pdfIn PDF document text
    • http://gakelapirafit.epizy.com/22366353499.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/anti_bullying_worksheets_for_high_school.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 5372 bytes
SHA-256: a36147e9ab3bc7d2163eade44523287a42a3a498a6561dbdbbe0bb0379f9b54e
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 4892 bytes
SHA-256: 9dbc99ed19aed5cd0d1e2173039ff49ef19b5884624dff1a33dab00a44d08ce7
font_02_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10464 bytes
SHA-256: cf226d9b7022875ab256c1350e00671e5210ceafcb69673f354cc03b5090e558
font_03_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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