Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f786ccf59bf864…

MALICIOUS

PDF

91.1 KB Created: 2021-03-13 13:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 71dfffb779c6e9e9038670112015baa1 SHA-1: b38f6ec48c7864c11ef9cdc77ad595636f1491be SHA-256: b6f786ccf59bf8644892792a014bddc30f28e5aac6f259b75f64cf0bf2565eac
164 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. It uses an invoice-themed lure. 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 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://midufefew.ru/wix?keyword=zoho+invoice+free+vs+basic PDF link annotation
    • https://cdn.sqhk.co/gotulurowav/75QujbW/remix_maker_app_for_pc.pdfIn PDF document text
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/basokavuduwogin-pimorulonu-powudepawa.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/9909955.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/gdha4My/tomando_el_sol_con_mascarilla.pdfIn PDF document text
    • http://xoruresifif.iblogger.org/eclipse_c_tutorial.pdfIn PDF document text
    • http://bazezirovif.iblogger.org/nra_shooting_range_guidelines.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/batoragubukepo/amleto_testo_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/polycom_soundstation_2_ip_model_number.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_95b651815dc043d6974e79c9d41c27f1.pdf?index=trueIn PDF document text
    • http://dunoziboxisi.epizy.com/danger_chamar_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/digiravazonarorajovi.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/fupetebevigowuvawedubexe.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_bed50cb2d9ec4bf2854e02f480b94e89.pdf?index=trueIn PDF document text
    • http://kejefutipetube.epizy.com/49193463061.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_6064a8bff0384290afb68e1a86f9b6ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/vikobuzuxajajip.pdfIn PDF document text
    • http://jomerijokera.rf.gd/fisodojikabede.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/dulenawopewulibewenox.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_5a04d68e5abd49f39d135982294be682.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/29294363725.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 5096 bytes
SHA-256: 9828937f449398ba01861ea077d2fdc17d9fa1765adca20a13f744d087f11e4a
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 11804 bytes
SHA-256: d04f8e86181913517f03f224e52376a8a48797ce804de3f5e2f45c35f37e09e2
font_02_sfnt_off000148b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B5 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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