Malicious PDF — malware analysis report

Static analysis result for SHA-256 be41bbfc03c40681…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 07:38:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d7d1d273ca0a2ddf4bac3905b1949e SHA-1: d343ec37965421e6f7a0a485096f28ba404555f2 SHA-256: be41bbfc03c4068151ef8e4db11f8dc25353d8c5048ff0275ad2c479f30d5244
176 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/wix?keyword=dz09+bluetooth+smart+watch+instructions
    • http://suziterunedoloj.sportsontheweb.net/fadagidawula.pdf
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/da4415fe08.pdf
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/9464100.pdf
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/159f43fe702.pdf
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/desabuzidetobas.pdf
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/fab334a0534b48.pdf
    • http://adanakebap.org/93457951715gzsk.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/what_is_aircraft_maintenance_engineering_course.pdf
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/jutasewijuzifi.pdf
    • http://wurilozi.scienceontheweb.net/sharepoint_framework_tutorial.pdf
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/26178bfa4.pdf
    • http://chelobaka.space/shark_navigator_dlx_vacuum_ratingscaiqi.pdf
    • http://razvivatel.blog/real_racing_3_save_file_6.5.1il0uj.pdf
    • http://vijevejumozugim.sportsontheweb.net/beethoven_waldstein_sonata.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/6051385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_0fd508301ba04628ae08fb578d92f01e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8cf9b7ce-1735-47b6-b2de-c378a6f94372/leripoxebugamokubugituje.pdf
    • https://uploads.strikinglycdn.com/files/4c55fdfa-9f93-48a7-a38d-ed6a4c2d50e4/gunezijopefodesebuke.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_015e396345b547daa05a4a3752eedb3e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e66b509-912f-4dc0-8a26-fb8709ba9bd3/ask_your_mama_lyrics.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_1660e88bebc54a078ac8c826d411c0c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9034c69e-e01c-4247-afe5-0cfa2f33e98f/how_to_refill_oil_filled_heater.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f634.bin
eb86cb2003c92bbe484e97df692593b8711b0b4db188db8ef32af20b9590f55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5620 bytes
font_01_sfnt_off00010936.bin
f4f6f85f31b52708dd8e1809e6a503505a83c2dc779d9971f4cc9f295921b992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 11540 bytes

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