Malicious PDF — malware analysis report

Static analysis result for SHA-256 039faff7898dd767…

MALICIOUS

PDF

83.5 KB Created: 2021-03-18 09:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 71477f066a466c1a35f61259a54ae9e3 SHA-1: 863eaacb3f79c1c78efa19d9a9e117527bfb94a8 SHA-256: 039faff7898dd7676743333caf024393ad6ee0418f26f6d7bdcab6adb05ea4d9
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, and a PDF_URI pointing to a suspicious URL. The ML classifier and ClamAV also flagged this as malicious. The embedded URL likely serves as a lure to a phishing or spam site, disguised as a search result for popular content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://leonvi.ru/wix?keyword=watch+got+season+8+episode+4+reddit PDF link annotation
    • http://demuxum.getenjoyment.net/paxabopituni.pdfIn PDF document text
    • https://poburazaz.weebly.com/uploads/1/3/5/9/135993358/7273212.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/4f80213.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/2691350f9e64.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/l_alchimiste_tlcharger.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/dovapifemiroxugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/add9f566-7b6f-4dd5-b87d-8f648ea98608/91650831523.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_6e822fcf901447cab3fb18692f3396be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/macos_catalina_clean_install.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/bcp_47_language_tag_format.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/46811738001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de231d0c-8ecd-4229-95bf-223a3496cb18/roruj.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_3ed46ce892ad4267b55d663d040a1415.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/67297386387.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/26170883407.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_4c4b587bdac54d24acdc7aa90540371c.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_6b6d2c995ef14c15ada548ddc873880d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/bottomsheet_android_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2858bb-da23-448a-bc1b-166c325f86b7/xegudapepamanobodu.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/46597458204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd2d0e1-f8a2-4d7c-b459-8c2d7e629731/meade_autostar_497_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0666efee-1701-4595-9137-d59c6064e723/tuxax.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/mechanism_of_alzheimer_disease_article.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 5600 bytes
SHA-256: 21ba0f21dfd2a056ecb151b9c7eb6a1db01337c0df1b04d5b2551ffc843f9df4
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 11440 bytes
SHA-256: 1f9cbc5b0a30d229fdac7759017baa4d192fa5c58a5633fc8bf800d410afdfaf
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 17484 bytes
SHA-256: 1e180598abcec6e8795736d13deed92924df5caa43e7223a4850d377f490a5e5

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