Malicious PDF — malware analysis report

Static analysis result for SHA-256 425db6a6ce875c96…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 08:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee1ea138517da2c323501fc62b524ca2 SHA-1: b4352e15d616d4830d6a09e6f519c2cf7be3942d SHA-256: 425db6a6ce875c96276b56f5bec4992d41ac07a91115b6a9365e9f83599c310f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a phishing or malicious download attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to compromised sites or deliver further malware. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/19b2d731db6460646cb0df145dbd15f5/38542802738.pdf In PDF document text
    • http://w3-japan.com/js/upload/files/vetixolanutetixaguximon.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/41143324937.pdfIn PDF document text
    • http://jiab.net/userData/board/file/jorivinuferelorajafaro.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/95911864487.pdfPDF link annotation
    • http://akvari-um.ru/userfiles/file/gamobewe.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/8296850047.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kakaxufepa.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/69930678561.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/pirubejanusuzoxepovuvod.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/72554758526.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091123142220.pdfIn PDF document text
    • https://okazionche.com/files/15906637595.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/67215602429.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/goxobamuxitevoraxegon.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kadagujutazibojamepuxoxat.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/vaxonagatomajofuguxigeme.pdfIn PDF document text
    • https://rajakedua.com/contents/files/97797759568.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kuludopazuxitemuved.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rikizemuwelaxafurapifab.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/telabawuxexizokoneni.pdfIn PDF document text
    • https://lordoptika.hu/files/files/45436885091.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/71669585081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mega+man+3PDF 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_off0000c6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 17548 bytes
SHA-256: 4d0c007158cf9cc1f267e125aa97c891c9fdfcbba4a04ca25d17f8ca24777e4f
font_02_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 9992 bytes
SHA-256: bf4fded1569f62f54de929d01706e6e561526b53d549339e4cd7733a32e119b1