Malicious PDF — malware analysis report

Static analysis result for SHA-256 442a9a5c83542c41…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 09:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71e13208038dbd026862213bc294ed3a SHA-1: 0d40edd63f8a48b19acee3ec462de734f8d92082 SHA-256: 442a9a5c83542c41c74d27818c0b14316a740785212122286ec4ef3ec109bf10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for initial access via spearphishing.

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://allytemp.ru/uplcv?utm_term=ppsspp+free+games PDF link annotation
    • http://adhunikjewellers.com/ckfinder/userfiles/files/nodovixizizefakiderewonur.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/86250385959.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/85768736786.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/69843268788.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zomun.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/32247437258.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/87287397385.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/26292627274.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/59576569416.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/47534867025.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/welog.pdfIn PDF document text
    • https://jjpremiers.com/files/zapotekefuxosuraga.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/vezurumilofojadeb.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/buturujozosi.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/42790440429.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913141351385820.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/zalulaxole.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/wifar.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sogabopuvikegijasipaga.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/watomujeweze.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/47514171599.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161388ab3e255c---luwatagolevimeruxiwo.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/sutizovem.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_off0000afdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDB 14780 bytes
SHA-256: 348dda07ba0608c82a886149fad1469ad33827d9d3575c08a6114ff8139953a5
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 10240 bytes
SHA-256: 39cf964fdf0706a58f8c77896e864679aadf6e7cad14143f93d880243115bbf0
font_02_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1