Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31ce051242ce400…

MALICIOUS

PDF

70.9 KB Created: 2021-02-25 15:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a98a87053e249e3a9d59d3625754af7 SHA-1: 35cfc8fbb5c8564f24817b0c7657e3312c34895b SHA-256: e31ce051242ce400605058f42507a3040a94621db2d05bdbd7503d28391f6837
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=logic+gates+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5feedb29d9b9d.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/e910fea85ca4c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_5ffb366dedc3f.pdfIn PDF document text
    • http://msertis.xyz/657639503249lit0.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/aBhetij/zapufigokol.pdfIn PDF document text
    • http://shoop-fn.ru/sigakunonodijerobjz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_601ecce6b2141.pdfIn PDF document text
    • https://cdn.sqhk.co/peruvereraba/fhcific/ants_vs_grasshoppers_movie.pdfIn PDF document text
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/mumezefaw-tosis-gadodop.pdfIn PDF document text
    • http://brumbum6.xyz/58030606217tj08f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5feb19de3476e.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/3697532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_60314e44d1443.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/gdpgeyy/76695655308.pdfIn PDF document text
    • http://lenudes.com/liwowiwamazue6eba.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://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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 5164 bytes
SHA-256: 9425dc11490fa30cf67c83cff901b32657bec9c96488cc238d8b284add7b9a50
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10104 bytes
SHA-256: d6bdc7714ec21dc1eda24574172e3c48d840e74b29a10d85f49cb9c2f01fcdeb
font_02_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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