Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee278f8f393d8afd…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 12:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35ce84a083a48942c3966cfadbc20cbb SHA-1: 7ea0a18280460510adb329843a9f22b5d94e3c99 SHA-256: ee278f8f393d8afd18359a935f63350f0ef4ac655bfbeacf573fabe2f5f36363
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on disposable domains. The document contains embedded URLs that redirect to other PDF files, suggesting an attempt to obscure the final malicious destination or distribute further malicious content. The presence of multiple external URIs and the link farm heuristic indicate a phishing or malware distribution campaign.

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://xajibur.ru/wix?keyword=ap+physics+c+electricity+and+magnetism+study+guide+pdf
    • http://fbdirect.site/stephen_king_movies_and_tv_shows_2020dr0k6.pdf
    • http://flowerport.shop/acapella_maker_full_apk_premiumzkbq2.pdf
    • http://fafesixokegigi.getenjoyment.net/tcs_campus_interview_questions_and_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5fef3986cabf8.pdf
    • http://fertpin.online/equivalent_fractions_year_5_worksheetyjzl6.pdf
    • http://fizebiredasibi.mypressonline.com/whirlpool_self_cleaning_water_cooler_dispenser.pdf
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6041848e85581.pdf
    • http://itdiscount.info/30773503704krojy.pdf
    • https://cdn-cms.f-static.net/uploads/4393359/normal_6021a3aeb1d3f.pdf
    • http://newyearshop.site/arteriovenous_malformation_of_brain_icd_1022m7b.pdf
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fddcb842adf7.pdf
    • https://cdn-cms.f-static.net/uploads/4401519/normal_60435cf751513.pdf
    • https://static.s123-cdn-static.com/uploads/4498986/normal_5ff95db497fdf.pdf
    • http://gebigulexejo.sportsontheweb.net/zasirerivavamadazobusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rodexiguv.onlinewebshop.net/84127140599.pdf
    • https://s3.amazonaws.com/nawosineromigi/78412005634.pdf
    • https://s3.amazonaws.com/fatisake/planar_waveguide_spatial_heterodyne_spectrometer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f9.bin
5425ca6b2782cbe0c651677009d2e2742c2626e1ee8fa799a6de8c66590c1116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 5660 bytes
font_01_sfnt_off0001051f.bin
9db992d389e587a21dcbb1f9acf75779a6bf24cde1ec495ae77ed9199370107b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10964 bytes

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