Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe1f8da4d05aff3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-23 05:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d44e5dc0146ef910425a2f11cb5cf828 SHA-1: a9d90638c01b96b3db176d80a02417f9217c0e0c SHA-256: dbe1f8da4d05aff37281bb0c8d25f443315f3cbee9b76b08083229004d7516d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=thoptv+apk+download+pc PDF link annotation
    • http://hoteldanang.com/uploads/images/files/jarudovepimonopok.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/duvudapumelexamojugaw.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/wesofofemelinawu.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49723429260.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/nutopoji.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/4090085782.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/37382276363.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbaab3c46d---salazab.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/152703834261449f3839b46.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/kuwezolamav.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_8C2A38AF1514920C.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77865537913.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/mujexagakuwubenetelurosiv.pdfIn PDF document text
    • http://protezas.lt/i/File/tobogibenupebexejazik.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/nabopeku.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/majikowufugibepusifax.pdfIn PDF document text
    • https://tierlistei.ch/downloads/12169368150.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/51104056648.pdfIn PDF document text
    • https://path.mn/userfiles/files/36105496864.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/nekoveme.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/movebevelitoxepino.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_off0000bd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 18132 bytes
SHA-256: f578598cbc3d1133e85979df8a959a96288da7698ef5610f7c1f8eb839746993
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10324 bytes
SHA-256: 52946f599580ebbe99301a1862ff55aca495760ced1e8abda4129ac0172b8add

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