Malicious PDF — malware analysis report

Static analysis result for SHA-256 c435b8ae2c56a91a…

MALICIOUS

PDF

70.8 KB Created: 2021-01-31 07:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 943ddc5417aa8fb824ba8f073fc03819 SHA-1: 80169b10a3939f7b3c28f1392a757265a40fa7dc SHA-256: c435b8ae2c56a91a0e9dd29d247bf2fbc127a2df7962ad28058f21cb2b60af43
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a URL related to infection lab values. This URL is likely a lure to trick the user into clicking it. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of an embedded URL and the overall classification point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=viral%20vs%20bacterial%20infection%20lab%20values PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412588/normal_5ff90433db48f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_600a4ca8b9211.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/ijX3Vjb/38607359024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc71e0936423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fd8629f92b3c.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/djiW8if/dark_forest_green_color_rgb.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/e62hdge/zogepoxoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fd2c6c781d39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fde3ee145505.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/cjiGgeo/5440599062.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/1LyJiiC/81937146811.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/fYzFvZf/99421595298.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/Eggkhg8/71305833045.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/gezizefefififa/pewodixavelufodakalulavu.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/telugu_comedy_movies_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/church_conference_program_template.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 5040 bytes
SHA-256: 7d9c92e5ee2a8cbf3dc5f45de2cca772fe00efd323a4e50723abe0bb95733ea8
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 10688 bytes
SHA-256: c42f8444b0538b0ee77cad86b2c7257b4c310bdc2dff682418717169cd251b61

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