Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f4be1a0bc1e201…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 14:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa1d3875ac53bf166ea9d2c758a9dba0 SHA-1: 9839f44e774c2ae415a3b137c4be085cd493fbe1 SHA-256: d1f4be1a0bc1e201b0609f99bd89708be1e8a2bb4c3cd324d15e8ee60243e9f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream and numerous external URIs, including one flagged as a link farm on disposable hosting, suggests the PDF is designed to redirect users or download further malicious content. The ML_NYX_PDF_MALICIOUS heuristic with a score of 0.986024 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://wastran.ru/uplcv?utm_term=intellij+create+android+app PDF link annotation
    • http://boracayg.com/FileData/ckfinder/files/20210902_23A6CEAED46A1901.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/wejegu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/14401535696.pdfIn PDF document text
    • https://businesslife.com/content/files/bijogemiwonugigonemubuk.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/62281466322.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/27402157259.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/13859181392.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/96207248530.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5hu76aik8ecalejpuc01be6psi/fumofow.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/62635594005.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/91352162440.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/xufekigogunoramoberojam.pdfIn PDF document text
    • https://mavibusiness.it/file/jedigobabefipo.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/50804361021.pdfIn PDF document text
    • http://lixtech.com.tw/ckfinder/ckfiles/files/19830815921.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/51378949275.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/toguxurale.pdfIn PDF document text
    • http://foodchemsino.com/d/files/84240786031.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/26579238652.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/78088824065.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/88397785463.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/97296269256.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/ladakoxofubibejize.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dewupodokiw.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/sikuxabevowuvuxur.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gabajigow.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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10420 bytes
SHA-256: dbecef689e82dd04a45ab8266f6c56aea2ac69babae4127ded03eef7c62ebc0d
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 18056 bytes
SHA-256: 4f4777eee50c07323dbf7bb114a65991146bd6b610d0b9d18d626b789a3e8b20