Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc56b151cc59cbd…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 12:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 489b2584ca4555781ae03523aef0ff51 SHA-1: cfac370e830026f76faec2f784181ca2d32478d4 SHA-256: 8fc56b151cc59cbdb1c0f75eaf658c3ead15dd87f15be61eb6644b1ed5e010e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bdsps.org/slbdavbatala/userfiles/file/37975819511.pdf In PDF document text
    • https://feng-shuiworld.com/userfiles/file/resumikimetetizuvako.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///49472065307.pdfIn PDF document text
    • http://webursitet.org/Files/file/pedesutunatarufazirom.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/nugipifesatirizoni.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/sebeburewuwu.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/78203263121.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/82434172498.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b28dc5f0a---75198166343.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210916022541.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/96720155678.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/sesikebodi.pdfIn PDF document text
    • http://yibetter.com/data/files/80836107867.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-22/20210922144606871475.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nigejajuxiwupatixowuxe.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/17182574133.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/56440065455.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/15005327498.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u5vg4qqm2729s2ga013g6vsmks/xogejazifimusovuna.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/4313806976.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/nonijuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=samsung+galaxy+tab+a+custom+romPDF 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_off0000b7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 10880 bytes
SHA-256: 0abb0413c999b60d5beabc9e6e5ba0889f7d5f92ce8e29ebeaccc2506a9570ea
font_01_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16016 bytes
SHA-256: d32bacc38f2ef4a629981568891314e8f79d80c35ccc837699fbb3e4c6c4a962

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