Malicious PDF — malware analysis report

Static analysis result for SHA-256 a434e4565b7807d8…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 19:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10370412dccbbd31e68b013e865bf587 SHA-1: dd23c8400c8c9393576cf18d26ffddf1ebe3dd59 SHA-256: a434e4565b7807d8ed571737511aa2245161977fda8e7d440df61622373a63c8
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 0.9998

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://jottigo.ru/award?keyword=aprendizajes+clave+para+educacion+fisica+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff470f528dda.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/suxoxepi_roxinolifumi_fovegoxiz_lunatibasolide.pdfIn PDF document text
    • https://zotawirimatoxo.weebly.com/uploads/1/3/4/0/134096886/wasuvabedetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5fdcdf55cbd9f.pdfIn PDF document text
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/xivuwin-xosulusomov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_600849547de3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5ff03d63e9a84.pdfIn PDF document text
    • https://terokusaf.weebly.com/uploads/1/3/5/3/135347070/d90429.pdfIn PDF document text
    • https://meputaxuxiku.weebly.com/uploads/1/3/5/3/135304120/dononifefetalimun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_e12400d01c5b4b439651210da289e402.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_0230cee61f764c3db104b836101873f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d76bfb-3d6f-4aae-813d-37638e2a317c/the_imitation_game_movie_synopsis.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_eb87526b44be478ab36be7396a1bc718.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_7725006110a0478fb600968f1473012a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c168a67b-b655-4a2c-b5ff-5f7a214ee713/how_does_moon_phases_affect_tides.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_412a51537879488d8ee3ab3ab2daa205.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5324 bytes
SHA-256: 110c91fb38095bed451a6c4a4e055c0c4391eb1c0dc3841a4d2718f9dd1dc22a
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 11084 bytes
SHA-256: 0236872a95faba03dcc0a65e63468f085e8b45d90973684128edf89cc57c4908

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