Malicious PDF — malware analysis report

Static analysis result for SHA-256 27df6bfeec0f39bb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 14:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb01fb83f7616ba443336715029e1cd6 SHA-1: 52b8061932c84e526343cc7f22233ab3a8fba55f SHA-256: 27df6bfeec0f39bb04515fc202323cf38d04928cfa67e39bcc5c28475f2f04cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating the document's primary purpose is to drive traffic to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=snapit+loan+apk+download PDF link annotation
    • https://lentes123.com/aym_image/files/rinegal.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/17080147971.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/29020196184.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85791150654.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/joritibojawenulu.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/sujavutibugivosuxizoxawi.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/57602591172.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/3415765445.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109102018168820.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210911_072901.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/40280643095.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/52954416867.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/97948136871.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/66064780725.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/bukekoridilosadizizaga.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/majitovebamavopuviv.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/jolixezamekasidusizemi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf10a6c4ce---xewakikavotivubetujob.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/7000287805.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/xitovazizur.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/tosavowi.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/kujuwadojosikavokalubiluv.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/54883949765.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021981227457191.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_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 10236 bytes
SHA-256: 90f72dc14ce2f0456fa03ab52454fbf8e2345641e90146849eff43b8ba1f5f57
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 18532 bytes
SHA-256: f0b066fb88329984856e603696a2cdd9f8b0edb2799859413eb499bfb3fb5000