Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fde832ee085e146…

MALICIOUS

PDF

75.3 KB Created: 2021-02-13 11:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9ecd397756b3b29c72012cbc9a0849f2 SHA-1: 233ea8572c1e4d5cc067a69c3e79c68c43bd5890 SHA-256: 3fde832ee085e146154e89636cccbcc6013fda81f2d170ccaebe186b14796c06
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true destination or host malicious content. Furthermore, the document explicitly instructs the user to disable security software, a strong indicator of malicious activity. While no scripts were directly extracted, the PDF structure and heuristics suggest it is designed to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/aws?utm_term=battlefield+bad+company+2+multiplayer+free PDF link annotation
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/292195385b.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/vobulorizijumifaboro.pdfIn PDF document text
    • http://katowad.22web.org/apomixis_and_polyembryony.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/c39eae7badf3.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/1771551.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/xezewafefekoxox.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/litegujeritimidege.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/6f5322b2.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/gegitiguxu-lojigipam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzipegubeluwo.epizy.com/bluestacks_app_player_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/81590122959.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/agisoft_photoscan_full_crack.pdfIn PDF document text
    • http://wuzugimekiwetad.epizy.com/boseroxo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/61383319083.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/dakilubilewoxef.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/rupimu.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/duvejojamoniwowemerifex.pdfIn PDF document text
    • http://jevoxomififewi.epizy.com/52077307841.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 5544 bytes
SHA-256: 309a01365ab7e569ae682490c0c49af8e7c369f059fa8471f48af7753149eebb
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 11564 bytes
SHA-256: cfdd28c60f028124d732bea265580fd99afebcc6c34471e1a416e76117f730a4

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