Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b8fc6528b36431…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 11:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8aaf7ec1addc41ceb117a9fde371e2b8 SHA-1: 305c835344bfdb5d07d8f7acdd101d28ff23b837 SHA-256: 49b8fc6528b364314f484612338ec4ae38c975f6317e2d34269274040738dc44
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'https://golowaki.ru/wix?keyword=yahoo+finance+widget+add+shares+to+portfolio', which is likely used as a lure for phishing or to download further malicious content. The document body, though heavily obfuscated, contains keywords related to finance, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=yahoo+finance+widget+add+shares+to+portfolio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478687/normal_6036bdeacfb57.pdfIn PDF document text
    • http://igcopyrightforhelps.com/how_to_install_maxi_cosi_mico_30_without_base0isyk.pdfIn PDF document text
    • http://ericksandoval.com/nojijivagadisc6hzh.pdfIn PDF document text
    • http://flowerport.store/best_hd_movies_2019_bollywood8tm9f.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/cgfjeAy/tijizox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_604b0146630cb.pdfIn PDF document text
    • http://citruss.space/fapeloloserifog48.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/jdjgXQp/origami_live_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_af503f8150684fad8ad8005887131f87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/24090858067.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_bf4c2e0b775d4985951be740cadd3bb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defipedibe/gixexufutelelir.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_355dd44d27bd41bb80855aacf776bf09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/43751053063.pdfIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_c508932e14024138bb4f21fee8c20332.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_6cc1168005a743cd8a480ebeded4f6cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/does_hp_officejet_pro_8600_have_airprint.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_a273ab61bee04dae99ad7b2e2a10be5e.pdf?index=trueIn 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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5468 bytes
SHA-256: b6b089447b5a25a61fa167fa96a10c7ffdfc4c964e15dc6d01c72bac09b1c3e8
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10232 bytes
SHA-256: 9412dbe8efd0c257e3571212ebf34fa144eb61a9c338e1cc58874e56cc3ed771

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