Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c843eca7739585e…

MALICIOUS

PDF

82.9 KB Created: 2021-05-23 19:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1a285eb8c68c924f06a93911f275379 SHA-1: 9ce31f7efb957687947bdb13cc1e3705c471e004 SHA-256: 6c843eca7739585e98ec6b17e16f02a8b4b0ceebbbc5ff1c320c9351f4540fea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://vilenefex.ru/strik?utm_term=marine+traffic+apk+pro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413019/normal_6037038ddf4bd.pdfIn PDF document text
    • https://sibewelile.weebly.com/uploads/1/3/0/8/130815008/74ad50bf6.pdfIn PDF document text
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/daluzerofexonoto.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/2161175.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/bitulivike.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/c7e3da0e7a.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/8a2110194f5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_603ef2d28b652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fd2f86acb064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_6066ec08b0792.pdfIn PDF document text
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/zenisez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_606a227c27c6f.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
    • https://s3.amazonaws.com/wavunot/80205785127.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/application_format_for_law_internship.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/85236323707.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/17954751497.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/32871937764.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/lupazilepifu.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/maryland_boating_course_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/xedupalakaw.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/how_to_clean_keurig_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/guided_archery_elk_hunts_colorado.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 4656 bytes
SHA-256: c393fb86db2608005f2bd31ed51b7bd47f82e20b00c9edfe8f642002e16731ed
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 11532 bytes
SHA-256: 052cd03e39b374edd15f6bf07c20e2596f32c60ae299279deb6aec0db7250385
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 16232 bytes
SHA-256: 1d4ebd634e9a4b1afc3ba2e660f7abdbad7ecfb3c20c2fb0daf688bec4f9a1d5
font_03_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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