Malicious PDF — malware analysis report

Static analysis result for SHA-256 815cc0510e7f9603…

MALICIOUS

PDF

72.7 KB Created: 2020-12-23 08:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 00345c5d8f92ed79a31128d2e0a2b027 SHA-1: 1119ae5d24ee8c898441ff6fdde57bd099f25375 SHA-256: 815cc0510e7f9603ab777e244937939e78e9db37ba5abf9c83271ecb01d1e9c1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to lead the user to a compromised or malicious resource. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

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://traffset.ru/strik?utm_term=mini+block+craft+exploration+building+and+crafting PDF link annotation
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/3039698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fab37405f5ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f873ff87b773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fdaedf6f411e.pdfIn PDF document text
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/0d84a5038cac597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366346/normal_5fdf5a4cdf737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5fae6b49822a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ebeb12-5cfd-47b0-ba6e-b474df9e3fc8/morageloxifakas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79566dfa-b8b9-4291-a47a-87dc32052e1e/klipsch_synergy_sub-12_subwoofer.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/hmh_textbooks_thinkcentral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5f74dd-cf9e-4103-b638-f693b89b4fab/muskurane_ki_wajah_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b3c0b9-d526-4f5f-a3b9-770cfd72a699/91628497526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a15246-9469-4013-9062-c1ed90c57562/juegos_de_los_simpson_gratis_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154f0144-68e4-4820-ac22-a47b9a82ab45/actividades_tercer_grado_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35c741d-2eb6-4a3c-9eb6-7e3c4bb4ed48/69640859842.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/arcserve_udp_agent_manual_install.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71A 5420 bytes
SHA-256: 843742685d52ecbd09bc5d4034171144efcd4d356b9a9048022ca174c7bc6171
font_01_sfnt_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 11164 bytes
SHA-256: f35b0965667d5ffb0434af8138f93690afdc60e684496a806e138a21afd24c68
font_02_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 16324 bytes
SHA-256: c4749174301d3c2ec3604e5fb15a552a332efdc4122bdd559afd3392bcfc3c3c

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