Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f24072bef9af5e…

MALICIOUS

PDF

94.8 KB Created: 2021-04-02 03:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7fa9f38bd60864b23d833462d8e8c204 SHA-1: 5f76bf26999e71cdf4cef3addb69264505f7a5cf SHA-256: 57f24072bef9af5e9d601b87159d4f949c26903528f90f2fc7e0c3249c9951d3
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://ponafet.ru/aws?utm_term=why+is+the+phillips+curve+important PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fecfc57bc93e.pdfIn PDF document text
    • https://voxalasodakuro.weebly.com/uploads/1/3/4/0/134042561/7917167.pdfIn PDF document text
    • https://tiwuvaxitunux.weebly.com/uploads/1/3/0/8/130874175/5703948.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/Xl8hHdJ/pou_egg_hack_download.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/11b5e8c7fced.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488580/normal_5fe384ff31d73.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/HiaUljb/mukenoxemulidon.pdfIn PDF document text
    • https://lemabifi.weebly.com/uploads/1/3/4/3/134319461/pujunik.pdfIn PDF document text
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/rowidolevob-mikemulawa-jidifutidiw.pdfIn PDF document text
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/pazekijojab_kigokepafuko_sugabedetajefiz_wixukitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_60351e329cc84.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/hcgeg6l/sedamumunofutifoxesojaxox.pdfIn PDF document text
    • http://mapitunokon.22web.org/jagidazotexifa.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/CgchdFt/76035352394.pdfIn PDF document text
    • https://sitiguzesamow.weebly.com/uploads/1/3/4/4/134401829/bawiferavuk.pdfIn PDF document text
    • https://cdn.sqhk.co/lovolipeg/o2Pzrv2/trusting_god_day_by_day_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzipani.rf.gd/11638810808.pdfIn PDF document text
    • http://jilezowe.rf.gd/44983836892.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_off0001343c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 5348 bytes
SHA-256: 8dbce1c8c62745207d09a6ba24643ecda88ce6268dc78d25638a266524ce44c1
font_01_sfnt_off00014658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14658 11552 bytes
SHA-256: 45e2bf8b15c46a5935bde30437737080b4f158e8fc7908122b738aaa6cbd5741

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