Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f62659834c87b2…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 20:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a61a6b84064df296a3437210f9b81b2b SHA-1: e6970fbab6749c37f7dcf61ce18c19edf5bd328e SHA-256: 55f62659834c87b20a8893aa89883b8a106f669a6fb8313c50e900fbc4b58e35
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://druttle.ru/award?keyword=alucinaciones+visuales+pdf PDF link annotation
    • http://medicalpracticementor.com/how_do_i_reboot_from_command_prompt8ncvz.pdfIn PDF document text
    • http://phulop.store/calculation_sheet_for_medical_reimbursement_haryana3wn9v.pdfIn PDF document text
    • https://vadalafazewa.weebly.com/uploads/1/3/4/8/134897988/5f44a90028f0849.pdfIn PDF document text
    • http://mazanatur.space/5689280546co0lm.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/waleterivow.pdfIn PDF document text
    • https://wetikifavuzimol.weebly.com/uploads/1/3/1/6/131606122/xefegozegulovoxobe.pdfIn PDF document text
    • http://m-ryanaf.site/fondant_cake_classes_near_meaqzwo.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/3789038.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/93299846698rpdz3.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/3550922.pdfIn PDF document text
    • http://reform-st.ru/puleruj9b4e5.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/kawotexulozax/android_studio_gradle_build_too_slow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d09ad6d-f0a5-4143-ba4c-8ef1574405e2/34041254122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b336909f-f9b1-4adf-83b4-82e870439f54/project_management_professional_certification_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/androidx_cardview_widget.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_b8ab01ca8a734d98a6a94dd582a9b578.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/gudazaku.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/anemia_hemolitica_autoinmune_pediatria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967a8511-5b3f-4cd6-8295-5b54c6562c7d/4962221680.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_5c0377daec014b90b05cb2e42aae26e2.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_fbafd17203474362b4944c199eba4e95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e7f7f3-3471-49b9-99b7-47fd7f48db18/samsung_vrt_plus_top_load_washer_error_codes.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 5104 bytes
SHA-256: fbf98de8b5d9e1607bc42a21c4773c6de75adaf475e087a97263731412518c10
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11504 bytes
SHA-256: fe2a21803ba144ac72ab046ffc9bb0949d0c9d35bcf071ca64ffbdecbdc99f02

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