Malicious PDF — malware analysis report

Static analysis result for SHA-256 780d349d359d53b4…

MALICIOUS

PDF

114.8 KB Created: 2021-03-06 05:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c817290408884c4e72bca4e4035fb447 SHA-1: 77d54e2e1508adb95cae2fb245dad2f49e445617 SHA-256: 780d349d359d53b414112a7941ab7e7a3d8280bae23d7d47658e0c74d679f639
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=what+is+fire+a+constant+threat+in+temperate+woodland+and+shrubland
    • https://cdn-cms.f-static.net/uploads/4484994/normal_6035a5c9a2d75.pdf
    • https://cdn-cms.f-static.net/uploads/4375896/normal_603999fb3f18f.pdf
    • http://fukijuwevo.getenjoyment.net/86083054736.pdf
    • https://cdn-cms.f-static.net/uploads/4387061/normal_60155c2aa5cd6.pdf
    • http://tuwukadinem.mygamesonline.org/the_mortal_instruments_city_of_ashes_movie_online.pdf
    • https://static.s123-cdn-static.com/uploads/4474450/normal_5fedab241d120.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_20c19977dc4b48dba69f5ba3a83e2bb5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/715595ef-08a2-442a-88f4-0aeee5592a30/how_to_use_braun_thermoscan_3.pdf
    • http://jidabalelibixu.rf.gd/rewrite_exercises_b1.pdf
    • http://wolawozel.epizy.com/sisadixutenuvoza.pdf
    • https://s3.amazonaws.com/jigezilor/guided_access_on_samsung_galaxy_s9.pdf
    • https://uploads.strikinglycdn.com/files/ebfb9dfd-3f6a-4b82-955f-fdd074573dee/planeacion_estrategica_definicion_con_autor.pdf
    • https://s3.amazonaws.com/jefobexapulow/14124609185.pdf
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a3f9f35224cc402798d2dfa8ffbec07e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6dc1f3cc-5189-479a-ac17-4683f798b0db/zikufigux.pdf
    • https://uploads.strikinglycdn.com/files/697db71b-d97e-4d1b-b415-46c9bb695181/best_resistance_band_exercises_for_lower_back.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_0e98d3df042045fdafcd07a558c1da2e.pdf?index=true
    • http://zojimako.rf.gd/feeding_guidelines_for_newborn_babies.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_d54438d72aa5413e938309a227a87603.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d3138848-5f58-488b-bfde-b415a5010ed9/48117203527.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_7016066ad0394af4a8866abf65ed8a6a.pdf?index=true
    • http://zudupaxub.myartsonline.com/zekorapubigisirumatimonul.pdf
    • https://s3.amazonaws.com/fifuto/26431838488.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174fd.bin
eecc58218d2aa27e8a7fcdcc70884710ea726384e50bc7df5d65e52bec8b8411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174FD 5520 bytes
font_01_sfnt_off00018795.bin
0477e99d3a237edd3dfc4a3d89f8405027e67d32dcf025420c0605860d943067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18795 11976 bytes
font_02_sfnt_off0001ae84.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE84 4324 bytes

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