Malicious PDF — malware analysis report

Static analysis result for SHA-256 4832b2a9869b950d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 19:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7d77b83be2f43fb3f0d92d6bbcdb217 SHA-1: 223ab186c5ec2d4f6347dfd87012fd57a8147d10 SHA-256: 4832b2a9869b950d0fd21c7770d20b09ca1c602f056a271f98bab883fc2ee8c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis revealed it functions as a link farm, containing numerous links to disposable domains, many of which are designed to redirect users. The presence of embedded URLs and the nature of the link farm suggest an intent to direct users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=ppsspp+psp+gold PDF link annotation
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210915171555.pdfIn PDF document text
    • http://santeh.md/img/files/betasuril.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/koruliwizimafakifiletu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/romexegexedixarinifu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42411555396.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/foremimuwinewojerosux.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/matipagaxo.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/wumos.pdfIn PDF document text
    • http://gr-chem.com/upload/files/2480821323.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vavujenorenemavumigise.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/86549705495.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/17528135174.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88805366282.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/91331866449.pdfIn PDF document text
    • https://onecre.com/images/content/files/semodage.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/49233449111.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109021019272699.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/83033761664.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/tojikixaj.pdfIn PDF document text
    • https://superpart.com/files/57346433814.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e176ad6142---18900642304.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/52117410489.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/genodologabisamitugusudu.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/ziviba.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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 19444 bytes
SHA-256: 49261fbbcfbb0d293a51ff5a345b9df9d906c983d7bc5df8a0df39f0fe99a945
font_02_sfnt_off000126d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 9880 bytes
SHA-256: 89184c670dece7965b244900b00ce9b885aaf1ce6cf1fe2919ca7baa08e9eedc

Open this report in the interactive analyzer, or submit your own file for analysis.