Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48fbbd812533b03…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 23:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dfe026387505f7a5996bbf4217097d8 SHA-1: f73918c120cbd4830092950da83f8c8b4f732162 SHA-256: b48fbbd812533b03c622e332e6aa26768f01b0b33117a0e0b0b62a7307f9f3c4
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 embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=bluetooth+headphones+low+volume+android PDF link annotation
    • http://telecycling.org/files/file/bisanarerul.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/45017135084.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/15894105678.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/9780122844.pdfIn PDF document text
    • http://wmsone.com/eimages/file/dofupozu.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/jewut.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nokotajixa.pdfIn PDF document text
    • http://trieuduong.com/images/Download/jusanifegaga.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/suzulup.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sedowetorabikul.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/bogusovolexadarime.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613872c06e227---dulaxuzomaros.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/16221988422.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gepukazafa.pdfIn PDF document text
    • https://iohrp.org/f_files/files/75838560044.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199326149575.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/xarejasifosovoxoradoraja.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/wiputevomowatudeb.pdfIn PDF document text
    • https://bawauang.com/contents/files/gobudosadulitekasironir.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/gunasu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e25962904---27993712318.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/18047774598.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/29264569374.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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 10960 bytes
SHA-256: 85d65c0dac2c02866111925dd75ef605253e92da79c5b69d7c2c420c9e6dbc3b
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 17632 bytes
SHA-256: bcb776a1b5b0c87825fb09f43ac8202fd7e0cf0ec29ff78442b2c98aae5db6ab

Open this report in the interactive analyzer, or submit your own file for analysis.