Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a7ae97c0812e08…

MALICIOUS

PDF

77.8 KB Created: 2021-05-09 05:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b9f8a11f874d73820625b79b44a83852 SHA-1: 5a8edcbee083ca2f003737a1a2a15a57c765387d SHA-256: b3a7ae97c0812e0834bfd0bf4483672b82218f87761be7be4aba261bbe73f836
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://soxebez.ru/strik?utm_term=sharepoint+2013+download+free PDF link annotation
    • http://farvestnn.ru/manual_para_aprender_ingles_para_niosw1j5s.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/kijotifepase.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/rifawo.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/ibhgigc/freedom_of_speech_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/wemigiwim/o6DfPhw/munoje.pdfIn PDF document text
    • http://nofuwev.iblogger.org/liwav.pdfIn PDF document text
    • http://bujunigalafe.iblogger.org/energia_hidraulica_definicion.pdfIn PDF document text
    • http://itdiscount.info/wupuxawovitovea7pwu.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/romijubirixe.pdfIn PDF document text
    • http://samoe-samaya.ru/27739762299dvoka.pdfIn PDF document text
    • https://novifabapidujup.weebly.com/uploads/1/3/5/9/135975767/nikami-xogabavoruki.pdfIn PDF document text
    • http://creditscoretracking.info/jakiw0vpup.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/pomoxelasul-bomelu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/tipozonike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b427d57-989c-4b5a-99ca-56ac64d49da2/43659060693.pdfIn PDF document text
    • http://sanonusujinuz.rf.gd/raliwuvekenabifuzijaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02eb6a5-8042-4ca6-8089-65fc676217d8/futunotokixojikedidorav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d9a567-7f50-495e-895f-2b5b6a311b62/mepuwexekedasutiwumumagiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e6cec6-60fa-4495-b6f6-e7bcb55bf2e9/74972520400.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_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 5636 bytes
SHA-256: b7cc82f12002935e620c208f7f9b57fbaaa7df8afcf0abc3de43278caa949898
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10864 bytes
SHA-256: a8dd17f3ee3b3ba21342f4c125ce34f38b2653b2ca700791016705c69f50a96d

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