Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb9613244569bee…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0a23542c07e2339647ec75dd3aaf799 SHA-1: 39bbcecbc9c0bdb63f4be13b4884bef439774f98 SHA-256: 5fb9613244569bee6fd0221101c723485feaa9b8f06890a3de3996f564ace82a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to link farms, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://srinivasagroup.com/ci/userfiles/files/sajitefevedikibexotiju.pdf In PDF document text
    • http://zaiger.ru/img/file/65194862940.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/47498495852.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/60354708206.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/47605919697.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109090703335397.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/25796879637.pdfIn PDF document text
    • http://swhos.com/upload/files/tujemuge.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/55805731134.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/zevasokaxi.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kotegirulegoloja.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/felulufiwejewux.pdfIn PDF document text
    • http://halmar.info/userfiles/file/raruz.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xovogunoxese.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/fumudufivugasonatu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302f6287998---20047421079.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zukisagevimugu.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/41146823841.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/87314861700.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/sukudigutumavosisat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=freecodecamp+app+for+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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10448 bytes
SHA-256: e90a647ceecd9fd2ebccdf1e266c95177139291414e6e7142c8f21fba5a82d50
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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