Malicious PDF — malware analysis report

Static analysis result for SHA-256 86790534d37d0b18…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 21:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d66a6a2009864c916b4e57924c575639 SHA-1: fa7f0179e223a70aadeee721a0bf701cadd7e734 SHA-256: 86790534d37d0b18df1108ea15b05d1b77cde4efe76de934093b14160e40aeb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely intended to lead users to malicious content or credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=nautical+charts+online+free PDF link annotation
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/xolewoxumiselusu.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/ribagikafumaregeras.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zevovedefugaperaritu.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/39569098774.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/vusizutamiw.pdfIn PDF document text
    • http://lecostationery.com/files/file/jufojipi.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/mogadef.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/46947283626.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/zurafujefokofonoti.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zififilokorovuvulipuz.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/18126557998.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/xadexokidatobupogoteke.pdfIn PDF document text
    • http://uteambio.com/upload/files/16751608603.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/6508194092.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210924032706580051ezph2m1gplmc.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/63674752365.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/67281603630.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/54562745645.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/51132867723.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/didotisamivija.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c5aecf65---rupezexazufuzovepobigurat.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/liwedifor.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/dorufowinetupa.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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B8 10512 bytes
SHA-256: 00b23ae8846daf3d6ad9f370b7f2d0db7c422a084e131ad48360f0fc990a458c
font_02_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 16768 bytes
SHA-256: b2e1257e4c36c0ec6ed5394c2b2a922b9d320bd8e8f1ffa61a73db74e4fae70e