Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2d7634634afd34…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 22:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18dc0b6bfea3c8de45b5f531b8075184 SHA-1: 98099c49dd8abe84efdee4cca48e0328cbf96252 SHA-256: 0f2d7634634afd34d13b0329ac1ac801251633ec41966852658fac2935c68330
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and multiple external URIs, suggesting an attempt to redirect users to malicious sites or download additional payloads. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=romans+8+easy+english PDF link annotation
    • http://heimundsicherheit.de/userfiles/file/wuvulisunozi.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34366753261.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/fafugisunavigogawenivomog.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b9553ad5aaf7b46259331766e8311cdd/74037581476.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/lewus.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/xofodaworij.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda1a074b---84670575451.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/zixezawu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/27281926026.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/pipedubajawuzodizuminuges.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109030717061893.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/26994135512.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/lowefuximomoniwimol.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210910203536017654ljo7nt.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/xofesosizulefuxemetadu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/jasojob.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/tuvitobedaneb.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/titofolan.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/nomatemuzadumegomesupa.pdfIn PDF document text
    • http://afslab.asia/upload/files/31846195000.pdfIn PDF document text
    • http://henca.com/files/details/file/14796337199.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/movebevelitoxepino.pdfIn PDF document text
    • https://flyags.com/editorResources/file///fumavatuzonujedobezas.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/dumabituganageki.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xinusebebiwisitufod.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_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 10724 bytes
SHA-256: 9fcd053a556ff8e89c0176bc2ffc87bdc098b4f4f80418eecbeca3cd0e43d214
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 17620 bytes
SHA-256: 93e0072d48d2129a3a550854d7913886c0572d8df56ab9a1037a8e1a82e45bb9
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1