Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a2f4d767df8266…

MALICIOUS

PDF

85.5 KB Created: 2021-10-16 14:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d8b9da4095c40b0d51c9a536a34d1d5b SHA-1: c7a767d9b714a36d345a4ce6e58b236d4cd32322 SHA-256: 80a2f4d767df82666b9600beb4a58bb9729a283190f113c61beb03c7a622e66e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the nature of the PDF and its numerous links strongly suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://eco-building.cz/UserFiles/File/79255108717.pdf In PDF document text
    • http://border-collie.ru/sites/default/files/file/96168035744.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/rugofatasinen.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/88857101255.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/11931021698.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/sinubisapefimolu.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/57470166275.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/57194195826.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/tewonuxexujida.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wezapepuwitezonud.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/6070079fb693c3961be2aca580cfc06f.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/135dd619f3593b87c2880369b1e05910/bekobujexul.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/19984274721.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/gekobokejun.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ebf88f93f---34751596414.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/figesozopibon.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/xojabiririzivi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/26954550529.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/25865011918.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/84031822411.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/wogijumanamela.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/5555032668.pdfIn PDF document text
    • http://drironcat.com/images/file/semepezujobodevenok.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/38030940508.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/viwegosasotuzubipi.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/jijemametarotuxudoteluram.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/35733579839.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/32801076564.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=your+a+good+momPDF 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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 18860 bytes
SHA-256: f572024a60613d43039818475ed7e5ce93a4d28d8a109025872073ad5a51749c
font_02_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 10036 bytes
SHA-256: fd1febc41befeaaaf455c716cb50b0dc7d12b885a42f03230d432370ccfac12f