Malicious PDF — malware analysis report

Static analysis result for SHA-256 e897a8c1662f0b27…

MALICIOUS

PDF

73.7 KB Created: 2020-11-23 16:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9e91e3e368ee4927396c8e89c0eada2f SHA-1: dc0a600d4c560ecf4a07458d61f18ba98faa1668 SHA-256: e897a8c1662f0b27a96cda89c48a6c581548cfdb9e073fd00ad704f5680d0b0c
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 0.9998

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://trafficel.ru/123?utm_term=breville+cafe+roma+portafilter PDF link annotation
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/5068479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5fa6ed01b8868.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/joxutosovafewemenul.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/xilidelikixixas.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f95e312cb74e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_5faf62671b599.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/5c5f17.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/31ad3d6c-9365-4f17-95b5-a355b9886a01/67677874670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50e598f-68c0-4d18-9455-d90aed1b4c24/vuzugedagegevu.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/sifuvuvofen.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/fajevodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90988acf-57bc-468f-b9df-f3f7ea8f254a/mesidutewenolamagopov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cbbacb-25fb-4e5e-aee2-ccfd2147f2d2/94261229818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70000200-15ea-45e2-b780-65c2cb5d60fc/58235270959.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 5092 bytes
SHA-256: 1dc2997505ede114272be7f7148a3c2c00134f9a62886ec27dcf8661ab846160
font_01_sfnt_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 10932 bytes
SHA-256: ed64bb42270f75d326cab434efbfa570ab9c2249af0985039c330d978e2a0555
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 17552 bytes
SHA-256: 8bd4720b91975af1986c494bc14cc18de7ab4b43b9ee9f3ceda54a6e8c5c2daf

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