Malicious PDF — malware analysis report

Static analysis result for SHA-256 48847c397ea76cd9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 10:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41a224d2561a609e0382c4f3e68fc18 SHA-1: 1ebf3cf07993a15e39d4c647e7fc9f941cf138ac SHA-256: 48847c397ea76cd908295cdc5ee3b1e836d24d43e48eb698ec3b3849bfcf3dda
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soxebez.ru/wix?keyword=beautiful+widgets+pro+apk
    • http://fb-copyright-help-from.com/the_lorax_2_release_dateh00bi.pdf
    • https://gojulujowavid.weebly.com/uploads/1/3/4/8/134886085/fb8e78.pdf
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/dadab.pdf
    • http://ita-yog.space/952589474832csft.pdf
    • http://7lessons.space/dobawonanawidaxopezovi8koyx.pdf
    • http://wotidoteked.mywebcommunity.org/fogodununejiwakexovox.pdf
    • http://liwexun.mywebcommunity.org/faa_aircraft_maintenance_technician_handbook.pdf
    • http://tamogulaganero.scienceontheweb.net/rekudovet.pdf
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/sozogi.pdf
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/6831870.pdf
    • http://vobalemujumojak.mywebcommunity.org/limika.pdf
    • http://gokawojop.scienceontheweb.net/mopirexosowexomizamot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zamemigojat/vekesum.pdf
    • https://s3.amazonaws.com/wazotojemov/types_of_aircrafts.pdf
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_75c29ca2ded54e81b39c2a268dc5dc87.pdf?index=true
    • http://ziwemasux.myartsonline.com/reasons_to_stay_alive_free.pdf
    • https://s3.amazonaws.com/tarajix/competitive_bidding_definition.pdf
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_aeba19a858d647e0a6ad7bf904201138.pdf?index=true
    • https://s3.amazonaws.com/wewuxuviwar/superdry_ladies_jacket_size_guide.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_8cd7a956153f48749a6ad27039719548.pdf?index=true
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_29a07b2bce3a4bbe9f3605e3c6e5ed34.pdf?index=true
    • 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_off0000ea1e.bin
b9fa8b840ea97322f01abfe7c1e56e393ad8955ee9bebd343c2c89353102e8d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5192 bytes
font_01_sfnt_off0000fbf4.bin
e9a7f1f6fe9da142c07344f02c9b34ac8ba8167abd1ff0e273c3aa0f82bb2a6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 11192 bytes
font_02_sfnt_off00012261.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 4324 bytes

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