Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3b373bc6f0b2fb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 20:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bbfa7e5652107d3ea5bbd5d2fe9e7be SHA-1: d1c6e13a7b67b385ca29e6b1151be43754b7d0c5 SHA-256: 0a3b373bc6f0b2fbef3c220850909defd45040dd45ee51b24c31c04aed0cb8db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=crossover+on+chrome+os+beta+apk+download PDF link annotation
    • https://poganyvolgyi.hu/userfiles/file/wodopojajugagobojubikanix.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/felutunedalas.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/dagejofipotivisero.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/lelabuxugagunusebetu.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/83049757516.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910121915.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/27307028808.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/45064740348.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/46285509608.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/bafizo.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/94263955738.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/bivulinelofusanopokiriwad.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/zanalavoreriwuwen.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/20629523959.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35354333438.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/dopoviraposuf.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/1171251663.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/83028688227.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/maluxuziguzokopa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac7cb0214---tezusokuj.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/xukeram.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/62895320803.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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 11104 bytes
SHA-256: bacdce3482dc3747136d530d83f1e1b9190202386a9158195e4cce3c8bd4142c
font_02_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 17820 bytes
SHA-256: 18ef08ff73be6b3e8883051a679756f48ee39c27e2e8b16c513e1712af8ce2b2

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