Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4e0c7916cc28b3…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 10:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1dcbf198681f38055863f84832956407 SHA-1: a0bccdfae1b877e12aa00034010bd3e6e753e798 SHA-256: af4e0c7916cc28b3d46eff2985bcffdd84d7371a1a8944b7304e13b05ea9ece0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a notable concentration on disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to an 'industrial revolution worksheet'. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the intent is to redirect the user to a malicious resource.

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://soxebez.ru/wix?keyword=industrial+revolution+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417221/normal_6005f6987e6f3.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/miracle_box_crack_2019_64_bit.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/momebogitukiranuxadad.pdfIn PDF document text
    • http://gefaveje.22web.org/xasalimeji.pdfIn PDF document text
    • http://dafilor.iblogger.org/letuvanevikekuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5fe0296b84830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_6010561861e91.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/1e6d0ade-6ac4-4bff-b5ba-26aa31fc16d7/panasonic_rice_cooker_10_cup_inner_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3d5b76-0a65-46bd-a845-d5f44a84e4d9/how_to_clean_filter_on_samsung_front_loader_washing_machine.pdfIn PDF document text
    • http://pazixurofuni.epizy.com/fegijimizulimodojud.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/vaxavojariwif.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/tuxawer.pdfIn PDF document text
    • http://tevaluzax.atwebpages.com/23902389927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bdc5fa-b589-4cda-b4f8-8f456b70a19f/inductive_analysis_in_qualitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/loberuzatepimida.pdfIn PDF document text
    • http://pamixawikisif.epizy.com/wopuletonatiwowusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1632cc7e-d0ec-4878-be9b-dd381227a0ae/tipos_de_manuales_de_organizacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d312b150-5ec8-4885-b06e-59dfdcf380eb/how_to_work_iworld_bluetooth_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/kesaxupisupuvinanebamokej.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 5280 bytes
SHA-256: 0bdb95b2780427f759d52d51b46638d55ce61c6128ee8304f6adf1167e73c237
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 10188 bytes
SHA-256: 040b38564dc8b8621baae8c5df18808429d47aa5657f61988109aa676f2f966d

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