Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f586e8a4ae085f5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 08:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bec75c3f91974799182a64f327d03898 SHA-1: 8ab9f09318d06e4ca2928507cd3e04274beb0641 SHA-256: 6f586e8a4ae085f5b1918ae4f5b54dc40f4c9afb7ab59d6f6cd07c2adaf439e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=a+quiet+place+movie+streaming PDF link annotation
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/41134192473.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/penepurow.pdfIn PDF document text
    • http://vo23.ru/upload/file/89258440542.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/6568266081.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/87048428749.pdfIn PDF document text
    • http://rayer.cn/d/files/ketilimet.pdfIn PDF document text
    • https://rintrans.com/files/zujosuxi.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/37977951824.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/jipogigulofejemiweboruto.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8468db2c---76500454943.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/31119944922.pdfIn PDF document text
    • http://5e10.com/file/14614640649.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/rezadulojabatiwulopewuka.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/belevidamoxuf.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kalegemivoribavin.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631933989.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/33704712927.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/93283033449.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/woxanirosuwidefa.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/kidawevirotovipa.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/6944295129.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/xigeteramobiregoxa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140408d7f157---mopamixi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/6200920574.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/15892254502.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_off0000b0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 11008 bytes
SHA-256: 44b300e4b8718f5ffb14e0dd9299f0a514031a27dcd38f3790f9baa3ee918a6b
font_02_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 15232 bytes
SHA-256: b608317ed495e0465c3e8e0683df65bf56bfe034c3710a32f762ce2922297ab8