Malicious PDF — malware analysis report

Static analysis result for SHA-256 15918cb751f3d103…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 18:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca4c4f7040a1a8fdae2a03aada4c2687 SHA-1: 10fbaa38435884ef70922c5af6f0b2b05db62860 SHA-256: 15918cb751f3d103b7b4d10fdb2f3d2d90e57824852c3cd921f2ddc47f346a19
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://fokemale.ru/wix?keyword=graphing+systems+of+inequalities+practice+worksheet PDF link annotation
    • https://cdn.sqhk.co/lekusovu/sjdJijF/60000775353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5fecc9b1d4cfd.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/17733412942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5fc575636e4df.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/discharge_against_medical_advice_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_603d8d3b09275.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/resugipuvadetivisimuvod.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/51661544371.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/how_to_connect_logitech_z533_speakers_to_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/ahdighi/photo_lab_photo_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_5fddd127936ec.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/kawebanesamudebup.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/pekijisamaxudozubikoxi.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/verbo_sum_latino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fdd719779804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wemaxoseni.myartsonline.com/how_to_improve_english_fluency_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/21734947457.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/south_carolina_medicaid_managed_care_enrollment_report.pdfIn PDF document text
    • http://tosurok.myartsonline.com/how_to_be_a_certified_ethical_hacker_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/professional_correspondence_letter_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 5724 bytes
SHA-256: 99a51c6bf73d8e7f0f267d997274350f8027189c79fc714735c9d77df8f59d48
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 10968 bytes
SHA-256: 7d637b540363c4b32e58cfb60e6b9a8f2d872e4132bedf0e7bb6de1f56b3cdf7
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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