Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae54cdb7f069c2db…

MALICIOUS

PDF

89.9 KB Created: 2020-11-10 09:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7cd164f4787f4dfa3e0fc3582f5fe21d SHA-1: 929ac5e7c00542e367cf620b5dea4c4677b4d1f3 SHA-256: ae54cdb7f069c2dbc82ac4d320a25d55d089fec463d60e8889b53aa84e812c2d
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://traffnew.ru/123?keyword=website+planning+worksheet+template PDF link annotation
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/4c8c99c8f36cc5.pdfIn PDF document text
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/82bb3350bc.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/bimatijumonole.pdfIn PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/802826.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/4907038.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/fcab981301c56.pdfIn PDF document text
    • https://koxubabu.weebly.com/uploads/1/3/4/3/134314291/7381842.pdfIn PDF document text
    • https://lavaseke.weebly.com/uploads/1/3/4/3/134383013/lemivuj-tojuki.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/rokived.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/1186822.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/87f38a49-4986-4876-9c5b-969acd7a33c2/difukeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62d6011-5106-4185-b553-f60399218021/bisakujeru.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012d34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D34 25808 bytes
SHA-256: 522fb60b56a57d6cdf36264ac4a5330f158c42df8d0ac895917042026886c164
font_00_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 5540 bytes
SHA-256: 70c745bbf91126cd5b8dbeaf7d5e008ffd19e3fef107b8f9886d9baac44d1323
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10928 bytes
SHA-256: 7b271b08b377f39198b6d99bd665af5086a722304367b332516dee2dedcbaed0

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