Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa12b31236ecc622…

MALICIOUS

PDF

76.5 KB Created: 2021-05-12 21:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9654a8b29a58d3c93e65aad699b2eaa6 SHA-1: 923a0c64412b0f3037bbb76c660b3d40361fca43 SHA-256: fa12b31236ecc6225ccf1d12472880184db6b4fd75e3d98ea69db061a0debfd0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites under the guise of providing a document. No scripts were extracted, but the PDF structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=cisco+ccna+routing+and+switching+200-125+portable+command+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/jotenitix/thhviiw/58970435767.pdfIn PDF document text
    • http://olipaka.xyz/kelagesu5enws.pdfIn PDF document text
    • http://neo-tp.ru/1877948540987q7y.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/hghPihf/radiant_church_kc.pdfIn PDF document text
    • http://bigtittybella.com/generac_gp3250_parts_manual4zypl.pdfIn PDF document text
    • http://okrasote.info/sandwich_spot_menu_san_carlosr0g2z.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/ggIB5ib/tabaxewofi.pdfIn PDF document text
    • http://ig-support-service.com/fusukisedibozvuo9y.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/ea2a6686-ee3b-482a-ac71-3d2799925044/echo_pb-250ln_air_filter_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b923dba5-b1fd-4c28-99ea-15453408bdf8/mevelebelavus.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/saffire_pro_40_win_10.pdfIn PDF document text
    • http://gemunedipu.rf.gd/detidobap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7048836a-88ce-449a-9366-e744e8c980b7/which_is_better_panasonic_or_att_cordless_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/pujoxelelabuk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/widisurofexum.pdfIn PDF document text
    • http://pesipobigon.rf.gd/acidoctose_diabtique.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/forever_young_alphaville_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/xituzakupusatonajap.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_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 6188 bytes
SHA-256: 84281278227481a89262a9501cee01bc05f6f0339e6e073bb7dd549445c22344
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10716 bytes
SHA-256: ba1736c3dbf64b4e54716b7ca1454f0ed77f98d2517ea793e15a0d22a27adc7b

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