Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bd81f835166931…

MALICIOUS

PDF

97.7 KB Created: 2021-09-09 22:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c01053dc6453be4f62317c24366f993 SHA-1: 58591e5225784c3ec4ca56fa856553653872dc6b SHA-256: 86bd81f835166931c9139aea911ddc85edaa9bf9ae84a1430423862878bb47f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs point to suspicious domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webmenuplus.com/images/file/fegimexidikini.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c52b87d26---kegakipub.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/72728582538.pdfIn PDF document text
    • https://linardi.ru/files/file/6679004295.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/69414988986.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/18221374394.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/64564225276.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/soziv.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/43437838540.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/95032811925.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109011556306003.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/bemenokowivu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/80452496488.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/92214818247.pdfIn PDF document text
    • https://almavilag.hu/files/files/27038074044.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/62656778087.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/negiboxevizowexakezodamij.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/pagegovubej.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/29442953973.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/15070335779.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/13378631867.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161374bc97886e---99643574019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+restore+keychain+on+iphonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 10708 bytes
SHA-256: 03425d8c87ae3980ae584ba31be0c91653647eec7f99171565d1eaab2c5ec630
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 19020 bytes
SHA-256: 67b0824d8cce31c7a109b68012dd26f57c253b80db9cf1ee17cd47fa184571b2
font_02_sfnt_off00016112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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