Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a8eaafb09aea60…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 08:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d2ee6a073ed86468958499134a20a40a SHA-1: 08ef5329b0ac666bf323e91b52a61cd66fa7bc94 SHA-256: 62a8eaafb09aea607ffab76fe0e976b7fe0cd96bf094d7e109c2c7b2d3149396
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to a phishing site. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=c+primer+plus+pdf+download PDF link annotation
    • https://gotoko.com/cmsv2/upload/files/wupixojerelogewiduvokije.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/165492813861450d0a9b880.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/womifuxogigunufudomirekil.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/8875737820.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42823143522.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/2386913074.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645fe1b199---xazorimidejewiturekogi.pdfIn PDF document text
    • https://jss-moms.si/upload/File/45954718989.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/16580460492.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614585ff9c418---xodupegatevozemumululesal.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/vozotikabikap.pdfIn PDF document text
    • http://fkhd.cz/data/img/jelixa.pdfIn PDF document text
    • http://dentherapia.hu/files/file/47425147302.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/fexakimodolodit.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/84039991348.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/99374127933.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/lavoko.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/36671264487.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/jesawovutosu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nelokelitipawiv.pdfIn PDF document text
    • http://superbarter.sk/media/file/samusevifiradu.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_off0000c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C5 16864 bytes
SHA-256: 4ed51cfd0c279d185958981a88d6159a5d34fdbd5c01b744b1737a2df4f59182
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10776 bytes
SHA-256: 4a589742c16e45d38f4e49e1663697723c4682e2633bf41a0be78770b3570114
font_02_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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