Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54b12f8150ab11a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-22 12:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aecf0b6da9fecb38d97ab3d52b5a60a1 SHA-1: 6412ea4b1a82a696b365893adf89daa6561997fb SHA-256: b54b12f8150ab11af10704115343bf9d1dfee1612896ad530436e22a174e0529
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm heuristic strongly suggest this PDF is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=champions+manager+mobasaka+mod+apk PDF link annotation
    • http://elverum-revmatiker.no/images/file/34872795038.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/kanevoxabowo.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/5085017371.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/23215456781.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vedogorose.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/96743540364.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/totolomowevutajumoxefed.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109032001242494.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210907150040.pdfIn PDF document text
    • http://nemalipics.com/87504791807.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xiguzozaka.pdfIn PDF document text
    • https://ags-car.com/upload/files/ledefodu.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/remabowogiges.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/66843188640.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d74b7f95---lomalabeguzolorozeri.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/76153556799.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/wupimuvafov.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210922150606_844812619.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901213441585942.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/gixexatejofasanen.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/94720593744.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ae39135f6f2ab80aa67b905854519c5a/33194697873.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/40162207803.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zofobomavadiwupinawejab.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_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 17244 bytes
SHA-256: 2e9a0885caee070d25e0b9e3303d6cd98a156ffc1a0784b1a9af0ebbbc470ce4
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10956 bytes
SHA-256: 733c3c135bff6a242aea6d4afde301698a2d27d7783b055852a2e7c40d7056e4
font_02_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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