Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2aef77198ef5dbc…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 02:38:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ded171877ede21290455f88315d406 SHA-1: 78a4e71d6972e4d14faff5ba1c998b3200e0ccd8 SHA-256: c2aef77198ef5dbc6a0c6e9e37c4a8af50b79d5712a90f9bbf67314c33598748
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing operation. The primary URL, 'https://botokaw.ru/wix?keyword=competent+communication+manual', is likely the destination for users tricked into opening the document, aiming to lead them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-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://botokaw.ru/wix?keyword=competent+communication+manual
    • https://cdn-cms.f-static.net/uploads/4369671/normal_601f8ebf3a825.pdf
    • https://static.s123-cdn-static.com/uploads/4411501/normal_5fccc2fb63554.pdf
    • https://cdn.sqhk.co/dipujabuxiw/jjogijl/download_murdergame_portable_mod_apk.pdf
    • https://cdn.sqhk.co/wosipuvetot/DEkKhbS/fox_wallpaper_for_your_phone.pdf
    • https://cdn.sqhk.co/kerutadit/5sFIThh/my_singing_monsters_dawn_of_fire.pdf
    • https://cdn-cms.f-static.net/uploads/4368466/normal_603e8cb7a33a6.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fd982bd6d7df.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_601920d33c17c.pdf
    • https://cdn-cms.f-static.net/uploads/4481168/normal_602e4dfd98c04.pdf
    • http://foxilajat.sportsontheweb.net/how_much_pulse_oximeter_is_normal.pdf
    • https://cdn-cms.f-static.net/uploads/4374976/normal_600a749f69551.pdf
    • http://nasufulorejuwe.mywebcommunity.org/xasajinivivako.pdf
    • https://cdn.sqhk.co/xagaxubibiz/ijgnif2/reboot_laptop_in_safe_mode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_d97390be4f294ae7b42f46af06f8bc24.pdf?index=true
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_9876c9cf13b54cf8893cf7a47eb2c642.pdf?index=true
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_e5663dc554d8403fa31fd9c18c420b8a.pdf?index=true
    • https://s3.amazonaws.com/wozoxub/xijilejavufafa.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/creature_3d_pk_songs_free.pdf
    • https://s3.amazonaws.com/fupanabivote/wallpaper_photo_in_hd.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_off0000ed28.bin
e79aa92a6a2f22f09a0283ae6b4734a1409b13729d62b73c4c1cd5153ca9814a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 4712 bytes
font_01_sfnt_off0000fd1b.bin
ae6894e5b0c7f653ca6690324f1b4f56c46037c2fc045175023a7aed0b437a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10468 bytes

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