Malicious PDF — malware analysis report

Static analysis result for SHA-256 0044023bc740a208…

MALICIOUS

PDF

73.9 KB Created: 2021-03-20 22:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 920e8cc5574796bff404b1030937d94a SHA-1: 84e8e581c13718237582c48ddf58eac2074581de SHA-256: 0044023bc740a208474a53c85851a9b343e8c6f004dc3e3fd8f1c55e6d79785e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=automobile+engineering+pdf+file PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471240/normal_600c616be9ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_604d170a20229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_60273bea0229b.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/Ljgf7v5/bawra_mann_dekhne_chala_mayanadhi_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_604e6ab7a6f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465707/normal_60145a2e3442a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_6055e18824fa5.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/05UUjg2/67250744527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5fcd9d4c793ed.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/Yqjbjca/deer_hunter_classic_mod_apk_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_605639f34aea0.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/UfZmoih/bubble_spinner_mindjolt_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fd76b82585ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6018dc1f67f98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416318/normal_5fff1797e2512.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/2hdJ5gh/hack_game_dungeon_chronicle_2._44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_600f3012bb3d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_6dd6cc46c0e74ecaa6515885469a81a9.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_88b3e439d0b048468a125d61f3032fc6.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 5

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_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 5104 bytes
SHA-256: dd8059cbf0227bef3afa4c423a9d8fba3d06065c86f8f03d964100b33babb209
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10576 bytes
SHA-256: 9aef7be84e12cbc86b78a1db6816fa62aad8bc051c599f05677acbd2943c646f

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