Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9026f16df3df9f…

MALICIOUS

PDF

79.9 KB Created: 2021-03-13 20:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86d43e3c5c8770eab7423dd0d7b8d56 SHA-1: 19b53f7a5da8444cf032a7b1b719db9dd855ac4f SHA-256: 9f9026f16df3df9f0a6987f7c70bf896a5fdafe4fa046fb9bf13d1e9a8619ab5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs, such as 'https://dafemum.ru/wix?keyword=john+harrison+guide+service+grenada+lake' and 'https://cdn.sqhk.co/dufolatik/joieT60/sapapim.pdf', are likely used to redirect users to malicious sites or download further payloads.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=john+harrison+guide+service+grenada+lake
    • https://cdn.sqhk.co/dufolatik/joieT60/sapapim.pdf
    • https://cdn.sqhk.co/milagaleja/oAgg9R2/billboard_hot_100_radio_station.pdf
    • http://itdiscounts.info/tajofuxuleti3i9h3.pdf
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/gujuduti-xopile-xemiwem.pdf
    • http://bloomwithdeanna.com/does_microsoft_office_2010_work_on_windows_xpjll8b.pdf
    • https://cdn-cms.f-static.net/uploads/4418788/normal_601aab6ab751d.pdf
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/subafubu.pdf
    • https://static.s123-cdn-static.com/uploads/4500432/normal_5fdff52a18ef9.pdf
    • http://nesobaka9.xyz/tagelipepixudefomiwujef94wfk.pdf
    • https://www.facebook.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pavujiniz/british_parliamentary_debate.pdf
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_abcaebe6a22548a3a90633d456c2583e.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/zimujoki.pdf
    • https://s3.amazonaws.com/fukepez/apple_tv_3rd_gen_apps_canada.pdf
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_ec8a8a70f4914ed89967dab1ed26e077.pdf?index=true
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_c488486aaf5943f398739ccee5af1ad8.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_1bcd28e924c1468bbda4277cae16bfc0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f823.bin
0d5ec4873037e8f06e4deb3f9b7b0ac69c6aa4f797bbc6ec4d8585244f9e6baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 5316 bytes
font_01_sfnt_off00010a32.bin
72838e8aadf53e7a63d2e1413dca8fbd620588ef2521366a1fdced524c084151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 11860 bytes

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