Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5fe886cedfc6c1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 23:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a9d0ecabb9fd4fab8671f66e833d2cc SHA-1: dfb0ae7a31575f85cace26cfcda9f53069d0523e SHA-256: da5fe886cedfc6c1c1f14905e8f19c473000f99ce04c0eb809704c1a871eacab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many using UTM parameters, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=angry+neighbor+mod+menu+apk PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420dbfd558e---73235277926.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/bidorowilolobuzifejejile.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/luwapozavitulivodoz.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/levinakulozivad.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/sidijumusigebipakepesep.pdfIn PDF document text
    • http://stylekd.ru/files/98182761325.pdfIn PDF document text
    • https://luminex.pl/upload/file/zawudotisot.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/roriniwavobegugefini.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/kisopunowon.pdfIn PDF document text
    • https://fong-cai.com/upload/files/93629096954.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/92077989496.pdfIn PDF document text
    • http://favourtec.com/attachment/file/51203972195.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wepiberuwisipomixo.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/warebozariwiv.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44783725326.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/77145989173.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/jizofutuxifitatimes.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/13655225454.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/xikasefub.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/mazajotaxegepifutag.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/58288814546.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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10956 bytes
SHA-256: 2b8aeb25ae6a2b8c414419672e12db4bd5aabf44818c3e224a3f674b12fd79d2
font_02_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 20060 bytes
SHA-256: 9c141f28c8beebcd591f137050530eacfb43402c5b9020419a864e0643167840

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