Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9e895436f8dc9f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-08 23:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cbfa24a8760baa17d415ab867a91f51 SHA-1: a61f388c7f2e09af61663cc287933920fe3d96ce SHA-256: bf9e895436f8dc9fdc8eb570bdbc155fcfeac84835af6e86493adb68d98dbe98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojanized PDF. The presence of embedded JavaScript suggests it is used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://gazomotor.com/allinone/file/71637102143.pdf In PDF document text
    • https://asi-filter.pl/files/file/sijulu.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/mojasuwidunozis.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/53326302072.pdfPDF link annotation
    • http://www.donboscovizag.org/images/files/finikaxunojunetinor.pdfIn PDF document text
    • http://clingac.com/d/files/likakotagedavibe.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/38565152009.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_BA9D9A18730D1A0F.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/84671277194.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jutowagidugifog.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/59659565649.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/masofimexa.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109030653407624.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/53536918022.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/54669654719.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/75693420864.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/luzagopamataxosokuzope.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/gilugekesosowifujas.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/xubixus.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/12796475891.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37040483147.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/82070134253.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/felofokukupufajomurizak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hacker+apps+for+rooted+androidPDF 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_off0000aeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB0 10652 bytes
SHA-256: dd8006ccb7f071fdbc692924c77f04f276b89e18c65270005d745b59ab526b2a
font_01_sfnt_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 15308 bytes
SHA-256: c2752dfb8969ad26c7096ccda22226586967e1a9c9e7d0f91c6b876c5ccde07a
font_02_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1