Malicious PDF — malware analysis report

Static analysis result for SHA-256 847b67a6000fa1b2…

MALICIOUS

PDF

136.1 KB Created: 2021-03-26 08:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34a19b901e7cb12eb53f3c863dcc49a1 SHA-1: b55f78364de861454491bf4c8b835d424d6736e1 SHA-256: 847b67a6000fa1b2a95c9b23d3948e44112c84cf4adb5db11e8012de7d8c5047
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/strik?utm_term=hitchhiker%2527s+guide+to+the+galaxy+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5feffb1532e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_6033e5824f228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fe74e498f029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_6026f61971a02.pdfIn PDF document text
    • http://getcreditreport.info/tamil_numerology_books_in_english798js.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_6049e59f61ad6.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/f2fd03fbda54a.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/b5792f1ef.pdfIn PDF document text
    • http://kyrgyztours.com/cfa_level_1_registration_deadlineay9dt.pdfIn PDF document text
    • https://sunajojafexa.weebly.com/uploads/1/3/1/8/131856627/64a9955023fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd6293f9c1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6024c52282275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_602704ef18fb1.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/zaxet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/wadabudekavareraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9c33d7-f0b3-4449-8a3c-9b90cb4631e9/axial_yeti_jr._score_trophy_truck_1_18_rtr_4wd.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/alamofire_multipart_form_data_progress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fe1f7d-be15-4efd-8354-a3ec241738a2/when_times_are_dark_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f547abb5-1aa8-4230-843c-27a4569414f9/primeiro_de_maio__feriado_nacional.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_off0001d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D766 5644 bytes
SHA-256: f6d44e5d3b1019f6de4e97ac2d9f14df927daf86d294a703eadb9e115d66c5b0
font_01_sfnt_off0001ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA7D 11900 bytes
SHA-256: 8223f9640bf426339e4eadb83efab91f3ae8767d257148e34f79f388bef12603

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