Malicious PDF — malware analysis report

Static analysis result for SHA-256 075f83c792b7b09b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 11:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf460827f842e462e9c6f3f6fc706d75 SHA-1: ad7818a8d80fb95a68eb6f852fba6559bf1bc4ca SHA-256: 075f83c792b7b09b8a033b78ca8da6f3d72199d5cc8f5f23c9878e2aa030a93b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a lure for a password-protected archive. The document body is heavily obfuscated, but the presence of external URIs, including one disguised as a search result for hacking-related terms, suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+hack+someone+instagram+without+password PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/jakun.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/sozewebuvelegofejud.pdfIn PDF document text
    • https://beaszemin.com/files/15843486462.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/74774135947.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xajudoj.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/94238287326.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/babemaxixi.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109070244138645.pdfIn PDF document text
    • https://bolahijau.com/contents/files/39834712737.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/94167688884.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/tororutaviboxituzarowuzek.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dusekaki.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/kovexowinadinudidogir.pdfIn PDF document text
    • http://raczcsalad.hu/files/86699345107.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/27079924274.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/88739305381.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/55427507594.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/doxetadobadurolagewusel.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-16/20210916023118969486.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pavitujenizufafugazesopax.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dagolosiganubugajum.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9a91f2af---60883938062.pdfIn PDF document text
    • http://sinoorchids.com/image/file/37608799693.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/vapusakinebinoviludajor.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_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 11184 bytes
SHA-256: f4b5c3c3c0c0c84750740d417d370e32e3023df7000ccd0df70313b59ef92746
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17800 bytes
SHA-256: a22099c9b30b4a2078e9e7697026d8e8f9ab1835f21ee7c882de0e1e6c4892ec
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1