Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91e24f11fb7aaa0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 17:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f7e833285b431b214415f9554e83a85 SHA-1: 664e533035bee3b4aa1273933e4133223d420e17 SHA-256: f91e24f11fb7aaa0d934a74c9f6a2e143976c93234aa8a2bf1ef1db3bc8a5e1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with a UTM term, suggesting a phishing or scam lure. The PDF structure and embedded links point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=the+sims+4+for+android+apk PDF link annotation
    • https://luminex.pl/upload/file/90521588543.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/26733179030.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/pilezitojowikelo.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jemejawizexi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/2etlm7sua76vqo1ri7ncjg2eut/mekiverarate.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/semilugivokegedipofexizet.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/xagimojulejopukiwugawa.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/fidagunimeg.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/97098266569.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fafd7f2a3---37812440512.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/danaminuk.pdfIn PDF document text
    • http://aven.su/userfiles/file/80123899902.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/86974568953.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/dalegu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/58513878414.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/16181285878.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/43813540416.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/66169768248.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/67810237489.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fufeleposopi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vigesix.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/29328873904.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/latizoxuwixik.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 17828 bytes
SHA-256: 278c49def0602241750559f42b70cc95c371d31f76d35b2faae5abbc55b737c4
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 10752 bytes
SHA-256: 30056c9c48a3336f0f1b5f17b78e99ea7e70bd127316212abb2bdc49f7f2fe6c
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1