Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aaf3fdf1319927…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 23:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81bd892a79c626b2bd25edca551d24ac SHA-1: 2ed9378d4ced10c2687cbb79a0e16a3e6b3c3f76 SHA-256: 31aaf3fdf1319927a6ac2a7dda5d3036e7ba1f6c82082010ad0699e1a28d8e16
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, masquerading as a product advertisement. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to product pricing, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=samsung+galaxy+note+4+charger+price PDF link annotation
    • http://chambreapp.xyz/primeros_auxilios_basicos_2019d4839.pdfIn PDF document text
    • http://accface.in/sharp_objects_ending_bookr2uuf.pdfIn PDF document text
    • http://bidujukasegopu.22web.org/posav.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/efectos_del_cambio_climatico_en_costa_rica.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/nokavikev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zigolura.rf.gd/stand_by_me_ben_e_king_spanish_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/47286167091.pdfIn PDF document text
    • http://lebidaxelu.epizy.com/ielts_introduction_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/jubifovejukikevosokix.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/lakedenizanomovexedivuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/buraxemigolagolisi.pdfIn PDF document text
    • http://vafipisepofowo.epizy.com/badowonoxavizo.pdfIn PDF document text
    • http://milanati.epizy.com/vijanilador.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/terraform_app_service_managed_identity.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/keypad_locks_programming_guide_be365.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/jawitiles.pdfIn PDF document text
    • http://lemelugilisowu.rf.gd/the_journey_of_man_movie_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/30790684070.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/nba_playoffs_injury_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/bacharelado_em_sistemas_de_informao_estacio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5588 bytes
SHA-256: 7bf52a28fabe42ccd8a91b687e45b296e5b5dafc2c717304d5c0344227f1ed01
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10616 bytes
SHA-256: 8e15f75e8494f0a2a63754bf46b433257b98949349d5c1ecb8bfaae3ff657615
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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