Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3e6284ee8cb6bb…

MALICIOUS

PDF

95.4 KB Created: 2021-09-18 22:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a1340fc25f62a625e32ebed09ede052 SHA-1: 8de3f1556e63ffef980e997ad25de1192c7fe6ad SHA-256: 3b3e6284ee8cb6bbb20202d01a6049d1d209f840428c799ec7c59556621b6ca1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://synerhu.ru/uplcv?utm_term=create+video+chat+app+android PDF link annotation
    • http://www.peritaonline.es/ckfinder/userfiles/files/87792588739.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/dofomefiguk.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906203147.pdfIn PDF document text
    • https://atavio.ru/files/file/46106152081.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/68722720529.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/78013700884.pdfIn PDF document text
    • https://limadelimon.com/images/file/27631498923.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/spt4avvvqjs5tee9uecgvr2mbk/71842107921.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/begizuf.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/33791283163.pdfIn PDF document text
    • http://rafaelokazakov.com/file/musulemiburefobut.pdfIn PDF document text
    • http://hijoin.hu/editor_up/61004734196.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/pojidamebuzakuvabujutej.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/30985566119.pdfIn PDF document text
    • http://pasaru.com/upload/files/84818870007.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/sanevebidi.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/67260951227.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/gagaj.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/xevuzegirenafinat.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/mesifilujavo.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/xixovisoparazak.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/37023372839.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/totaxidopinomemes.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/sugokobuz.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/vakusewebi.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://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_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 19656 bytes
SHA-256: 40d4cdde8289513d3fc56d6b3e5c6e8627ed7a5d39f1f28c06b8c6fae24cf22b
font_01_sfnt_off0001407b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 10492 bytes
SHA-256: cbb738289281d08d7fa6e882c123ae8851acba9f93c9ed5a8c3c5e5eeef6e402
font_02_sfnt_off0001584d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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