Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73f6f00bd76f915…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 22:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3e4c0b982cfcb1625d1908a7bddab5b SHA-1: 4a02899ff12e52a5e3580171fec81ebacb39d1e4 SHA-256: d73f6f00bd76f915a19d6d869badf8c3992e22cd1963c968ae996e227fd231c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for such links. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=aquarium+fish+mod+apk PDF link annotation
    • http://gimhaejazz.com/fckeditor/userfiles/image/40752084457.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24357769230.pdfIn PDF document text
    • http://netart.hu/userfiles/file/gadef.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/71270481616.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/pivimetadixoposumipawison.pdfIn PDF document text
    • http://abnicum.com/files/file/kowaxagovala.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/sepuvob.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/pozexulenalore.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/82286821002.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/43441025412.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/2397717769.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/15351582920.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/detetupiselor.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/siwamufepa.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/nixugoju.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/dawofavelomapaxu.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/kawoxuwisigitikomarewuze.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/lutej.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/bedaxijoroji.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/tetaz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddef09d66d---divumodetixelaxudul.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_14_38_21_9608.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/36947705988.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/mulipinazalexiz.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gimedoginisa.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/2765849058.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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 20656 bytes
SHA-256: 2c19b53034d57a76a6829ddae502859063bb86fd05627df052e5275488acf048
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 10704 bytes
SHA-256: dcc98830a0e6ab214aa165bf40df4ce11cc3d074946fe2bbb81e3ad8320324c7
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1