Malicious PDF — malware analysis report

Static analysis result for SHA-256 085d4bd2e52328eb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 13:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1731ba62b97c33ba9c7cc3929bbd71c7 SHA-1: e96bf5fb353a6b7863d8ff2bf114c64baa1199c7 SHA-256: 085d4bd2e52328ebfffee767306c05080c640870b70cb438b50fdd779a629c00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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 http://pronobile.de/catalog/file/gesilebow.pdf In PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/70882489389.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f48067a15---wiluxajosubedurowujo.pdfIn PDF document text
    • http://jsdarvin.com/files/jedukef.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/zevaxaputisa.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/kexazamorolasiniviz.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/nefafemebimovove.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/92706090574.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/27443186588.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/razupapenexuliwajiko.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/fetuwef.pdfIn PDF document text
    • https://themalc.org/files/file/nagitiro.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bulebexemebubowuvu.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lijino.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210902105541538688.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/jodoled.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/niluvopev.pdfIn PDF document text
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/wotovivifi.pdfIn PDF document text
    • http://gibisch.info/files/files/94883248728.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/fudivesume.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74970019258.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/71d41fb704f1d7512ff6e59d33f54589/webosubefudukibagi.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/16405773260.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/futagarufitabadibawer.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/26579080471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+unlimited+gemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 10956 bytes
SHA-256: c8710734329ee7e58b523f424be686674540c0926bc5d73f1623b6015ccd7313
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 20620 bytes
SHA-256: 96c38a65ee7fa8ddfc0a60411ae90c23130e3886942dc91f37c7cc2820a6282e