Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8df8d69e0deaf7…

MALICIOUS

PDF

80.1 KB Created: 2021-04-08 12:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eb9bdbccba8ff146569d88b83a1bd8e3 SHA-1: 9e54e7f2f64ce2bde10a6579c311aef6938766a2 SHA-256: 4c8df8d69e0deaf792bad1eac3f4720058f99e6dc311342fec30e18037503dff
186 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 0.9997

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=altered+carbon+season+1+episode+1+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453551/normal_6025b409519ef.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/jitiwepop_zaribal_xamadubi.pdfIn PDF document text
    • http://geponimodenebev.22web.org/cable_tray_size_calculation.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/kofodo.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/fotaluwu-rigafez-donif-megivobetu.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/124685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_60480d479e4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_6042e66cb5b8e.pdfIn PDF document text
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/vagitebadifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_603d1992563dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60348dbe213b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5ff364a2a0d66.pdfIn PDF document text
    • http://bizarur.iblogger.org/63418374535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6053566c49bf6.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/nafamaragisek/apprenticeship_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38706dcd-f8e7-4f88-8c09-f696b7786db4/51675935037.pdfIn PDF document text
    • http://relizaki.epizy.com/hard_5th_grade_math_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/kopunogexuvezikogugisup.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/film_beau_pere_1981.pdfIn PDF document text
    • http://tuludipetowizad.rf.gd/aoe2_goths_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b54a53-b589-40f3-b5bd-6a6c1217857c/kejexapok.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_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 5248 bytes
SHA-256: bb993de15a92c181dbae50e0131da3262cd7e815d0badb56c4ae2ddcdbffd6ac
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 10972 bytes
SHA-256: 699b3ea00e2f41a124fb2edac112304d2f4f4cb9a27fd2dfd61ca9ec9b420bc5

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