Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57ddd92e2cd5078…

MALICIOUS

PDF

74.9 KB Created: 2021-04-13 20:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f2d2da2bb1c943d7939819e9ef9b40f SHA-1: dd6db1f4854bcd11a6084579dd5e104710dc74f5 SHA-256: f57ddd92e2cd50789ea55f1df5dd2e2dcbacca52d3c410f8f31c00b5831032a6
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 0.9996

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://mezovuduw.ru/strik?utm_term=maze+runner+series+movies PDF link annotation
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/webokudolunuwes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_60614b2b7001d.pdfIn PDF document text
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/botajelebela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_5fea1e04a7ffc.pdfIn PDF document text
    • https://valabonef.weebly.com/uploads/1/3/1/3/131379230/mesunibexedatuzoduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_60568615e2393.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/0c31c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_601a7ee68c69e.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/aditya_hrudayam_stotram_telugu.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/easy_algebra_worksheets.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/kisagoz/44216608059.pdfIn PDF document text
    • http://pejijolefisawiw.epizy.com/dell_optiplex_960_ram.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/envision_math_grade_4_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/tim_ferriss_show_naval_ravikant.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/82894071086.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/sunezofoxaxo.pdfIn PDF document text
    • http://lavufufoludu.rf.gd/34966998931.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/zojufix.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/kawabata_shotengai_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/java_string_format_double_percent.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/hot_galvanized_steel_sheet.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/doxijemovevuduguzasizex.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 4916 bytes
SHA-256: 126abc20a00d4f3757a964e60756f82e4560eafe8f8e201d381ccefe7db721e6
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11104 bytes
SHA-256: e816afc7854b43ce8e08ec67523175988f7dda10174b7b768a44117be2b9a14f

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