Malicious PDF — malware analysis report

Static analysis result for SHA-256 499fea6507cfb4a5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 18:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65d9bede9fc2ab94a5cd76c3946018e4 SHA-1: 1d4c5d3fc90c66a7c5a6d51cde27c43496d7946f SHA-256: 499fea6507cfb4a5c66831af565194e6b6c3a24cfe2a57ab0cd586d6b556a006
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sm.ac.th/ckfinder/userfiles/files/3624190809.pdf In PDF document text
    • http://kfbma.org/files/fck/file/53741226120.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gajebipeviz.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/nilixofebitodijuti.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/kegixigogopalufeni.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490267b7528---pijexipamefaride.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210928_F14DAF66A2B78A89.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/32348804548.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/53010846608.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/29270683924.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/40770029686.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/10489383793.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/spjnjcu71rvcfaeg535up5na2v/43486152603.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pafex.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/62983117980.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/mezejenimowupoxulajapew.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/31221221602.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/dijudi.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/bizejata.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/10723196039.pdfIn PDF document text
    • http://dgkno.cn/upload/99121688066.pdfIn PDF document text
    • https://parkettworld.com/upload/files/53952439013.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/lezezonaxijonotekapigiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=airplane+mode+turns+on+by+itself+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 10992 bytes
SHA-256: bc39f21b94ace33c49d4708e7399ffaece36e66f5a95f5e5d2161b181df3b0bf
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 17440 bytes
SHA-256: 67de3f65270d0a94cbc37f8fea6c96630c71a6a40eb6add7b7819028d928b03d