Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea72a97ecdd5628…

MALICIOUS

PDF

74.6 KB Created: 2021-04-06 12:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 313690c40132299f7acfb51dc0484604 SHA-1: 28ccd5027a9b42bc9122433287b0d41447415b8c SHA-256: 8ea72a97ecdd56282f4b0eb050630d3388d43c833424fa962e02ba88e45cd93a
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-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://dugedepap.ru/123?utm_term=kindergarten+report+card+comments+ontario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365591/normal_605ee5802cb53.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/what_are_unforgivable_sins_in_hinduism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fd14adff247f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_602533d25debe.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/absorcion_y_distribucion_de_los_farmacos.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/writing_numbers_in_words_worksheets_1_100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofikexegugimum.rf.gd/kajakodagopuxaxibigoz.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_26239abad73e4e5d86bd9b36db52ffd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/40747811975.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_ab1c95c9af584aa2b0271bae0c3b49cd.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_70063fedfd9249d19f1d7eb0a555cd72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/teloxapobepijebefuzexowo.pdfIn PDF document text
    • http://lofadezowudekeg.epizy.com/75287319375.pdfIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_2e6b547c465b4f65860a774245d28b42.pdf?index=trueIn PDF document text
    • http://tifatorebuvu.epizy.com/vavivilivotawikalodolexu.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_ac53427002f445f18157ea43a5bc7825.pdf?index=trueIn PDF document text
    • http://lirepotinemos.rf.gd/tobekesemalateruxeta.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_9b53b0bc4953453c82f25e4bef3aa3ef.pdf?index=trueIn PDF document text
    • http://sumidemeg.epizy.com/alegreya_sc_bold_font_free.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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 5332 bytes
SHA-256: dc6065eb6b9c08608fac88240b7c69b76f96d9d2d8f7bd936f399460cd1a8f90
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 10564 bytes
SHA-256: c6e359f85eddf0f007a4dc800b358332643d75ba93438d9b5d1ceafafd55bae6

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