Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bc409a95db853d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-11 21:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e80bc1120c5b5ac2065393df88124c8 SHA-1: c0edf40eb70aae6b53185466bf0465f28bc2a037 SHA-256: 46bc409a95db853dae9732faa73e75104ed52781d7a65b1a45472d912055ef5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming, suggesting the document's primary purpose is to manipulate search engine rankings or distribute links to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.sandipmallick.com/fckimages/file/watubawomifew.pdf In PDF document text
    • http://teamtrinity.net/trinitya/file/gojowi.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domorunalobalekakozom.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/xenudipezalediripugoge.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/jikineneje.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/ruvuxukofomosopasila.pdfIn PDF document text
    • https://etadelloro.it/images/file/tudusiwiwudotizuwik.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jufapukibefuwiz.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/xopew.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/31134424149.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/nufowe.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/fekapotijikevizowaja.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/44159645603.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82070660647.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/wefiwowitisazezebepowi.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/lorejejomubisibuz.pdfIn PDF document text
    • http://whatdwellswithin.com/file/60214700397.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/wipojudapaxerametawaropu.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/34554205747.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/14209894657.pdfIn PDF document text
    • http://arucax.am/user_images/file/40220858732.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/97871043833.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/busukexejulidoxujote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=medical+physiology+walter+boron+pdfPDF 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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 11232 bytes
SHA-256: 807bd8f304150b5db4b98104ddef13b2e59fe40566ab1d093070a2548a6aa2c2
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16700 bytes
SHA-256: 91bceec1fd934020d58f396b1f0dc542c21f5bc3607b9030543d1e1cf41dcfc9
font_02_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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