Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e0a687f44b4ca6…

MALICIOUS

PDF

93.5 KB Created: 2021-04-08 04:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 692a8f090806d387ec90ae4ac3a5af64 SHA-1: 54844fee1a25e90d077010f33a9610cc42b7a9d8 SHA-256: 54e0a687f44b4ca68e90a38252960b57b3aed6db74174fd75c0f91519ccb4559
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=haddon+matrix+template PDF link annotation
    • https://cdn.sqhk.co/pupevadojas/ihahgDk/wifi_analyzer_tool_apk.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/galaguvome.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/9Xidhax/navokexepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_6012b2b1b93e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_603156c7ab447.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/44566309829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_604f5ad7e3304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_604866961fc8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5fee1943e9b82.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/bujusojedofonuzukilet.pdfIn PDF document text
    • http://desawigoxikugaw.mywebcommunity.org/20729117079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_605a236c296a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_6015fc9f8a589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5ffa1a7a28c43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_60052598ddb92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_f4e4f8c22cc54da881f9431544bc0662.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/78891217165.pdfIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/the_things_we_do_for_love.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_b08e4569f0524afe83d0355894cead86.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/software_company_portfolio_sample.pdfIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_8175fdc980ce469cbfeffd24bd65b3cd.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_721e29f4ac98499fbd264ede994c6b51.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_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 4956 bytes
SHA-256: bb339063f80b00ff2eb382636c9cadc3ebbdf720aef986137ed323b456696586
font_01_sfnt_off000141cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CF 11496 bytes
SHA-256: 8879073ebd727d2c9b1ffea3170a0c334345fab8be6766b962a36589ea70fc35