Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc31d9414a53c02d…

MALICIOUS

PDF

151.4 KB Created: 2021-01-27 03:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4300f43d4178d95aa4545457e847ed8d SHA-1: d4a1f41d7f0d60e7d6d7560654830f2049fd48c9 SHA-256: cc31d9414a53c02d962ad47aa7e06e5b18e5611e1db3b1584c1877191c9f6668
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL `https://druttle.ru/wb?keyword=mirror%20neurons%20ap%20psychology` suggests a phishing or social engineering lure, attempting to trick users into visiting a potentially harmful site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wb?keyword=mirror%20neurons%20ap%20psychology PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5ff23e66e1cc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5fdf557a4687d.pdfIn PDF document text
    • http://expressday.online/8_ball_pool_rules_black_ball5ovx3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5ffe158a1d270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fefcb814f330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463792/normal_600356230c248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368756/normal_5fdc9af5ea3c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fc7729594a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fd7cb4eba3f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_600b51c51a60c.pdfIn PDF document text
    • http://it50life.pro/pottery_barn_small_velvet_stockingpd7ju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_5fea257c66eb8.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/rixevozajixezos/femoral_block_ultrasound_guided.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/animal_world_map_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/81933879498.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/8468944706.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00021a1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21A1C 30784 bytes
SHA-256: 0155ed7c6fd7e29f51c66013e29490561f5cb6beb331473880291623e1ccc7b5
font_00_sfnt_off0001e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E06A 5300 bytes
SHA-256: 27fab17db522e23b6227ff4d866444bb1234afbd16aefbdd8579e961ae510143
font_01_sfnt_off0001f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F283 11880 bytes
SHA-256: 6856c4de2970f1c6e76f28d3fb2bceded0ff16785de621780de3b2df4d271a88

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