Malicious PDF — malware analysis report

Static analysis result for SHA-256 514228f4a53b3ad9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 23:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cec78df3b173a3c2e25da7145ec719e SHA-1: 118a8903b36cd73eb7bea8e2eeff35384361f736 SHA-256: 514228f4a53b3ad931cc2707459df1d042e0f6ed1b195a7466f77d57c9a78c85
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=causes+of+the+civil+war+crossword+answer+key PDF link annotation
    • http://vvinorama.fun/578076463958wupj.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/tovuganajip.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/99363189225qvlb1.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/4ae4e3cab88e4.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/ijaijhb/86698412662.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/kofekix_radasuninilu.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/mixobinim_burukeb.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/giTFjgH/zovufunuwajotez.pdfIn PDF document text
    • https://cdn.sqhk.co/wixedineve/ZidEoif/nijuwuworuk.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/botuj.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/6625c581d3a9770.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/7079752.pdfIn PDF document text
    • https://bufivenejolerad.weebly.com/uploads/1/3/4/7/134709937/0e509a83707064.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/dopixejokiwim-fofojojebimeme.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/ninemiwebeju_giriv_nonowalubeveri_fadig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_1193a35513ec40558fdf01c569fd8f0e.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_46950bf473eb44f883a67e0109ae4bb2.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_7c5cbc753d2e4ef7bf58bdbe88756d4a.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_5c08b8757cd94e9d8dc31a62821ed87a.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_a1d4f2c47bd54967b071198e5d0d91c4.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_0d2650b7438f43b1b72b88db14e95d47.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_64402fe30b2746b88b2eb88b764f4c5a.pdf?index=trueIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_2a7d69e99d8c4e30b1e50e223bbb62da.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5332 bytes
SHA-256: 814a44ecc2e55d33f543300b68690c00ccbe524e8d8c191c6523b6a4df99da71
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10840 bytes
SHA-256: 62c191ffc729a7461145a8dd039b276b51ba57548c20497ad41c7ca6374e6ae2