Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff6c54ce9a2ed2f…

MALICIOUS

PDF

79.2 KB Created: 2021-02-15 02:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d680cb44f3f51c9a3bd2b1a79fe054cc SHA-1: c91f0f18675487cdb2281c3860539fc5abfbffe4 SHA-256: fff6c54ce9a2ed2f14334086e0ac152b539b7bb7c1dc65dbe372d7453c5ff0f7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=cyberpunk+2020+classes+pdf PDF link annotation
    • http://all-host.site/gujigiwuwanaxiqwqne.pdfIn PDF document text
    • http://1fps.ru/finish_powerball_quantum_max_safety_data_sheet75wm4.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/M6Yiang/hunter_assassin_mod_apk_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/micaaXa/dungeons_and_dragons_races_quiz.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/ecb1e9f144fc2ff.pdfIn PDF document text
    • https://japekubejur.weebly.com/uploads/1/3/0/7/130775222/d8c060e32a42.pdfIn PDF document text
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/modogijumadipafili.pdfIn PDF document text
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/xubite.pdfIn PDF document text
    • http://espacecmb.xyz/lineless_art_guide2l6bp.pdfIn PDF document text
    • http://3bureaureport.info/lucky_jason_mraz_sheet_musica5rz5.pdfIn PDF document text
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/budiga_vesonipi_xabemojab_mofotet.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/safawirezajobusuwi96quf.pdfIn PDF document text
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/tudavi.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/95df677e7f.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/suximawo/akcent_songs_free_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/32519895246.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/80953292045.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/audio_cutter_apk_pro.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_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 5636 bytes
SHA-256: 12ee184b5638df813bcf51de82e0e5b09e3f842f235011ea2cc7cdf325e3e123
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10292 bytes
SHA-256: ab07dcc2414e54de0f02028929b2756537c9800c908aa74b313bb34472547cc0

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