Malicious PDF — malware analysis report

Static analysis result for SHA-256 a422b108b53af3bd…

MALICIOUS

PDF

84.0 KB Created: 2021-03-29 14:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c8159259d51652b6f77cb31671a05eca SHA-1: e46c37bd1bbeb723a6d061bc947cc1839fb3ab9b SHA-256: a422b108b53af3bda330c5be6522fe2e6b38834b1dcb8f3719d32f18e5980f03
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, appears to reference 'cancer immunotherapy pdf 2015', suggesting a lure to entice users to click the malicious link.

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://midufefew.ru/123?utm_term=cancer+immunotherapy+pdf+2015 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fcfa29399611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcff588ef6e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_600dea41cea15.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/sagozas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408321/normal_60049d5c48fea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5ff83120d0650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_600e86531a796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2d7fde55-dab8-4b8f-bf17-b1e3cbeb5ee9/how_can_i_calm_my_anxious_cat_naturally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bff90ad-7f63-407c-ad45-385ff326dff0/ap_story_john_updike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c0db0f-1d74-4597-9776-463d0e187b17/tomufepojilel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae314f40-59ed-426a-b0d0-8b40dd70be2f/90883913803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dc06a1-1d95-4f51-aafb-9644c8512ef5/john_deere_mower_conditioner_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1349c908-e857-46c3-a0e0-648d51a200b5/how_to_make_homemade_swiffer_wet_jet_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28235a9-0644-4160-88cb-775b077476ba/how_to_find_the_asymptotes_of_trigonometric_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8700bee5-8ad2-4035-8c8f-ee44aac28b82/xofanizazetifup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaa3387-2170-4782-a0ca-0b42d126265a/96240016819.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/fogejinokumosemidofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c91f52-9965-4335-a8f5-3edad5faf199/shark_navigator_dlx_upright_reviews.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/what_is_validity_and_reliability_in_research.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 5644 bytes
SHA-256: dc0833975eca8d7262d85c84531c6cb6fb36bd8b4fcb2ca0dc74c638048357b2
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 10624 bytes
SHA-256: dd7f6f1d351f9a429a35ec9280a1dd7fed8dfc0ada02ad4eb95a7d907fca5341
font_02_sfnt_off00013326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13326 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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