Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb807c0992dac6e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 01:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fe66102a4572c756905b69d8f375a0b SHA-1: 20d54afe3e7d06da7811000febf0f327d532cd8a SHA-256: bfb807c0992dac6e4f7766737cd0715ddd68fbd7d00d315979f9609fdd34241a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=5+letter+words+that+start+with+ad PDF link annotation
    • http://bancasemecanino.com/userfiles/files/sofanixafuw.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/34059808292.pdfIn PDF document text
    • https://nada70.org/userfiles/file/zesodenikemodidafixusezi.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/96649238209.pdfIn PDF document text
    • https://satesayap.com/contents/files/gapobexije.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/29820447516.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///70217819682.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/mabufuxozojire.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/tesaziketusirit.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393251d5c66---lazimasisogok.pdfIn PDF document text
    • http://grafitym.kz/files/file/fudewikuzelaboxo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rowovoleluzatiforo.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/60481787297.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/taluzakeviragipotede.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kavur.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/mujavevitibikedorediju.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/93859893424.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/ketukul.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/3552394827.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/kubasusivowa.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/33393210139.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/51857065351.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/3453481553.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/96963819764.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-6/20210906043310872675.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_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 10364 bytes
SHA-256: b992b4b29e9ddf100906ac2ba127d49ea1c0921e8ba2ad2f1c12aa4e311a8067
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 18608 bytes
SHA-256: 0548b8d35f024867a8e1351f300593ee43fc54e379efeb164366c9fb559a1def
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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