Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaebf94119a4fb2…

MALICIOUS

PDF

81.7 KB Created: 2021-03-31 01:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab3a21acccd67fd9a0883136a7eead2f SHA-1: 52903c6f03c9d6aa8620310c263f6f46eb8bbf55 SHA-256: ecaebf94119a4fb254f6fdcf93a9c94c69afebc3832bde609d8979c1a67e36cd
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://xezojetit.ru/award?keyword=digital+painting+in+photoshop+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489245/normal_5fd1470a3d12f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_60374e8f6ad23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_6013299d15401.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/fipofokofaj.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/waste_recycling_process.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_604629889209a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5fdf9c5685535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/206cac93-073e-49ad-a56f-0635c8fc6bfa/43364612618.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_03d0dc3e76c04252a91c23baf2452bf9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/52739916500.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/kubimobegopajofexo.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_f6075e36fd624691b51aca87cdb645b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/686714cb-6ed2-44a7-a8bd-9c21fb7501c1/50635796330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e153c8a-4f5d-4d5c-961a-6a5329f71092/40364873192.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/60300459046.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_2478a60e2c464212b5516df955644c94.pdf?index=trueIn 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_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 5208 bytes
SHA-256: 5d27d7674505576c0d03d2e2b1d4ac552d01b25b65fc35edbd2c32f96a1fbc18
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10600 bytes
SHA-256: 7542de8cbcea324b0d48225c9f2466a35b4f5313ae6e2886fc6ffe016eb3c34a

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