Malicious PDF — malware analysis report

Static analysis result for SHA-256 b041f547da046b2b…

MALICIOUS

PDF

85.8 KB Created: 2021-03-28 01:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bb7b243d24379481504dcf1a94d2da77 SHA-1: 39f3c1043b5eaa3b54049f8945112639aab671d8 SHA-256: b041f547da046b2b8c3e6caa4b8350400ad109b11e1308ca1124cbf8224e2ca4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/award?keyword=h%25C6%25B0%25E1%25BB%259Bng+d%25E1%25BA%25ABn+c%25E1%25BA%25AFt+file+pdf+b%25E1%25BA%25B1ng+foxit PDF link annotation
    • http://zobebukore.22web.org/how_to_connect_dell_monitor_to_macbook_pro_2018.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/gofagivuralogu.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/2569e49f.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/sap_accounts_payable_for_beginners.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://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_30199f81e7a644ea9be99f19aa4ee748.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_30fcd7f9209a4396afb69e045daa2482.pdf?index=trueIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/8966907172.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_2b508b223eec46a593a057e242fb8c39.pdf?index=trueIn PDF document text
    • http://segegilomojok.epizy.com/xanuk.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_cb0babaa7f824c27a27ff2241ed7479e.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_5aa5763f977942239dfd9686b72716f2.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_cf42aac77bb849b3beb2dde07d3eaa5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/how_to_test_if_gold_is_real.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/24249586576.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 6028 bytes
SHA-256: db25d949d125c6e331a321238ab85ed3cddcf1cfb5c880e54f53ad4f1ab44dda
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 21724 bytes
SHA-256: 219d12bab6d554595bc71819e018e9a56ec1b28242912cc9bacff0c3b019e5ac
font_02_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 16376 bytes
SHA-256: f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828
font_03_sfnt_off0001399b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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