Malicious PDF — malware analysis report

Static analysis result for SHA-256 36170ebbd421e390…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 09:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9511046773341c3e17e793f1aa479b62 SHA-1: ace3c5f7af89eeee2dbce5d36bb859bc7bb16a31 SHA-256: 36170ebbd421e390434b85857398e20ba7591133abee23c461c9ef4b42e3b5fd
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a suspicious URL that appears to be a link farm. The PDF structure and embedded links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malware. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=massive+warfare+aftermath+mod+apk PDF link annotation
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/duloranumesizuj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229fc74bbe---letomug.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/vumuborewedebigineko.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/mesujesewojijag.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/15683629360.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/96642505830.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/62537330215.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/61012607040.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/16511044015.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/depodiropulibozutefufesu.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77237549601.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/35731230732.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/depuzidilozug.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/wavewonadudoni.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/xenudukiwaf.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/91205835631.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/68555643540.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/dakipojilixezezebud.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/jufol.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/28751557628.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/tunonubavujazomidukow.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jefezofejiw.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/fedebuvof.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/fetapa.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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 10852 bytes
SHA-256: 8f2ef40d67cdec00a95d00b005c8e526c0927a5204ed07ab0da6cf2f5de3afdf
font_02_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 16184 bytes
SHA-256: 59ad0cdaf580dfd12c30361586439dd52869b218d28ff15d418ea40c48aadab4

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