Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36808f974f43924…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 03:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f55ef7735f3192011d95ec44d0bcfda SHA-1: c351da63f6bf762593cbefcefaa6867d338080e1 SHA-256: f36808f974f43924183c394d222c6df1b47a0f41749f4876c32896f984d1e7be
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to redirect users to a large number of external URLs, many of which are hosted on disposable domains. This strongly suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://bursakaynak.com/userfiles/file/92103917679.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138fafe14e11---75348285714.pdfIn PDF document text
    • http://rnralpha.cz/res/file/tewur.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903145207392620.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/wepixa.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fojuvip.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/90597388314.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/33556617419.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/37494112639.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/43276776815.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/nifos.pdfIn PDF document text
    • https://krusomying.com/data/file/naxuluwogazaginatutira.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/baluxasonoxujiziges.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mejonobasusudujafimudu.pdfIn PDF document text
    • http://friulanapanini.com/images/file/62255971342.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc266338---buwosilobejimuronerigiwer.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/95021534039.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/lapatakosibam.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/78707880825.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-2/20210902072807784164.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/10976861619.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wakis.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/najuwi.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/1568241968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+1000+likesPDF 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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 9860 bytes
SHA-256: 502879613186b7a42243b95219c1785b43ae0c7d569af01f6d1018ad1b1ac12c
font_01_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 17744 bytes
SHA-256: 018628fd5f7dc2f172265aea6db85846bfdd0812914eebc39ece323239b1f68b
font_02_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1