Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa81e31ffa5d9e46…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 06:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 773d9e811694212e804f5d9e0ddaa7fc SHA-1: 8dee298d491069b419abc1a8bcd6d2b24ae3e40a SHA-256: fa81e31ffa5d9e46344b50841c6b0fda40f0e1db95b36ae8f0ddef0571f69f33
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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 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.
  • 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://pelibifir.ru/aws?utm_term=what+different+colors+symbolize PDF link annotation
    • http://lebanage.iblogger.org/site_acceptance_test_report_format.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/5633870.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/8182706.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/kumav_futemono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_5fd2d87de0020.pdfIn PDF document text
    • http://vigetatefix.iblogger.org/white_christmas_ages_of_actors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443594/normal_604eb645071e2.pdfIn PDF document text
    • http://kulupitodawiri.iblogger.org/wickes_6mm_plywood_sheets.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/fudomatewa.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/vuliwisuwig/46413859155.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/genanarobezerovejulebasor.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/birthday_photo_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/83070125486.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/vorawukobasizema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca949795-1ab9-47bf-889e-5a61ffec57b3/wofafalikemobi.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/41017686047.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/67592994469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c369f1e8-cfef-40f1-b920-060087183c22/how_to_start_a_travel_story.pdfIn PDF document text
    • http://tojuributesef.epizy.com/zisagawerekakebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edc67cb-c4ce-442e-ad0a-520f82ca5901/what_time_does_taco_bell_serve_breakfast_on_sundays.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/tataxaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/taxamodiwetirigaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/92407132169.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_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 5568 bytes
SHA-256: 4028e971f0b961703b89199c52d10f9877070fd5aded0d420913aabc7c4c9bfa
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 11116 bytes
SHA-256: b4992690e50c7528cbdb5f766ec79c754e279c5288fbdcafcd191ba4c712813a

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