Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf81e93cc18395…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 09:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 388c251df2e095de07b726075eab567f SHA-1: bb3c7346570afc2639fa1a2f56bc4504fb3175b4 SHA-256: 15cf81e93cc1839592b686720575585f356a2c77f5d28b06b6d9c031c04b17e6
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/123?utm_term=game+insaniquarium+pc+free PDF link annotation
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/sategonuz-vemekida.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/how_to_be_a_music_lawyer.pdfIn PDF document text
    • http://italiahot.fun/panasonic_cordless_phones_with_answering_machine_costcolw77n.pdfIn PDF document text
    • https://legopojuze.weebly.com/uploads/1/3/4/3/134369078/2a4e63.pdfIn PDF document text
    • https://fivubiforozoxi.weebly.com/uploads/1/3/4/6/134676017/bozukawiw.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/what_does_finger_jointed_wood_mean.pdfIn PDF document text
    • http://discount50.pro/from_superman_to_man_summaryl360x.pdfIn PDF document text
    • https://doxuxipineza.weebly.com/uploads/1/3/0/7/130740192/foluxeniguvaxe-bamizeda-retodiri-mejubi.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/management_of_tmj_ankylosis.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/vifusupegiza/carplay_on_ipad.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/81254319528.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_0bf88fd0b8c543e793de2874f862aef5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/50th_wedding_anniversary_sheet_cake_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/nuvonojiref.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/rivijamituvixixi.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_b702b735cfc04ce8955e937da4bf22c4.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_3870a29f7cff4bcf836b67945f056a36.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 5288 bytes
SHA-256: 9bccb595c59b29aeadedc79fb478f365cab6bdd4874280e2b3a9f42715a837cf
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 11100 bytes
SHA-256: 6c78ed19571f47c1fb92bfe64b3ccc96c4769c5aadc222057fe87f4b2562d7a2

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