Malicious PDF — malware analysis report

Static analysis result for SHA-256 d689dbae544e2383…

MALICIOUS

PDF

82.4 KB Created: 2021-03-07 23:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4d7aafa00f314491911b33104c77907c SHA-1: 9006bda85d99ca98fd7e626ffdff7f7af402439a SHA-256: d689dbae544e2383c3311aab568ffd4f2720ef9d605dbbf648a84208e2480cc5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to financial topics ('allowance for wife') which could be part of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://ponafet.ru/aws?utm_term=how+much+allowance+for+wife PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5ffa4192cb5d8.pdfIn PDF document text
    • http://reduslim-official.website/constant_deviation_spectrometer_experimentpegqj.pdfIn PDF document text
    • https://jiwonilasipa.weebly.com/uploads/1/3/4/3/134313366/xovigibati.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/patijuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6023068b2f29c.pdfIn PDF document text
    • http://fomilexavekol.22web.org/petobakovefozutopavekasa.pdfIn PDF document text
    • http://magicwoolshop.com/jopepujuzomujedamenerejofoeljc.pdfIn PDF document text
    • http://bigmagazin.xyz/92526926576xsseu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_60151fbe18c62.pdfIn PDF document text
    • http://nojosomefoviw.66ghz.com/number_theory_concepts_and_problems_xyz_series.pdfIn PDF document text
    • http://spencermcman.us/best_graphic_design_software_for_beginners_videoxxd30.pdfIn PDF document text
    • http://okrasote.info/when_does_after_we_collided_movie_come_out_on_netflixhlyyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_40c69dee8e9040de89c3b6a5b15d5f89.pdf?index=trueIn PDF document text
    • http://fedasumenusum.rf.gd/betofagalofujo.pdfIn PDF document text
    • http://walefofu.rf.gd/98032977962.pdfIn PDF document text
    • http://xizijerupo.rf.gd/zonilusizadovadogavuga.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_31b6f9d37ebf4acea05731d89e0b1251.pdf?index=trueIn PDF document text
    • http://wumaxodozitokaw.epizy.com/boss_dd7_delay_review.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_a977a28863a148cdbc939cd718419560.pdf?index=trueIn PDF document text
    • http://pirarotuweze.rf.gd/31017255386.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/lutixavotiv.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_7770501889904011a84850b8bd470b08.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_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 4996 bytes
SHA-256: 8ec710229549d3f98859968b63c8ecd2b381e1870f96c5642c6a176252e44b28
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 11020 bytes
SHA-256: 48daa839c2e472b4264a5faa96b91fafd515ac902f1aceb528878231cf27e014

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