Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80dc5d220ea97e9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 18:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30fa596f22b8368c0200611f82a88297 SHA-1: ead0ceb0287f000ef26ab1811239792ccfc28f69 SHA-256: a80dc5d220ea97e94abeb317f4060cfc55efc21a34fecdea55bf485c38594dff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The document body was heavily obfuscated and unreadable, but the presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jualumnitoronto.com/editor/uploadfiles/27982991634.pdf In PDF document text
    • https://kaplaitalia.it/userfiles/files/nitefareluwogo.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/80164524429.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/48071917850.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/68134870525.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/bumop.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/28243956014.pdfIn PDF document text
    • https://artenika.pl/fck/file/74263382335.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/fofem.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/nebogununupetoma.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/fekodezolezusuvuli.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/42368498371.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/45418525869.pdfIn PDF document text
    • http://sdes.in/uploads/puxisapizupanowiz.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/61571775179.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/maniw.pdfIn PDF document text
    • http://bdnchem.com/upload/files/25990680597.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/volonebuzevesa.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nolelubo.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/dibodobep.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/jabazo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xoxugofo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zudanij.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613034a40a7b1---gasuriwiwaridibovoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=descendants+3+watch+freePDF 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 17644 bytes
SHA-256: d108284359f4dea4dd6640ec811d4a39002a0b889a4192be5dde24b82c8321eb
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10572 bytes
SHA-256: 0364dcf51a9c028bd49f3e62399ccdce5b8f23cc2333117eb5b439685bb8984e