Malicious PDF — malware analysis report

Static analysis result for SHA-256 206a21ca8697fd5a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 05:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 068f051aa2eeb431e704e880839f23d9 SHA-1: 388b74e1bbfb64e22b66272ffac08a6c40a5eac2 SHA-256: 206a21ca8697fd5ae8fd1da8029426dd6edac8436d19333dd85ce9e8f7965df5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://greenbins.ca/ckfinder/userfiles/files/82709858598.pdf In PDF document text
    • https://kimcert.org/E/file/zugodizosorokowexosisedox.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/gevudapakibizonel.pdfIn PDF document text
    • http://palami.by/images/file/48779901290.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/zenosivefolijigufol.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5877a4fe4d95fb36549aec99ca534d81/81000174945.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ad2196fa---93009610617.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/92125961413.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/zowonoginemewavara.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/42867878838.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/rixunifufofajafuzax.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/sovaxitud.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/78608569918.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/40223814116.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/fagorak.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/50307762563.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/54992183461.pdfIn PDF document text
    • https://wrd13.com/force/file/rusifeg.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/86615520206.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/80123806339.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xelud.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/movonufi.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/90751115369.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/88240596242.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/46985816467.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/5444451837.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/53011771840.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/54127414606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+one+ui+2.0PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 20756 bytes
SHA-256: 881c9df07884f15cf0b823502091dbbc4b707e592fea38ecbc0ec2e795019707
font_02_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 10156 bytes
SHA-256: 738bf71a25032a99260aa6ff6541f54e657459b487ddb7976c95e4508ceac41a
font_03_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 1804 bytes
SHA-256: 3e0df04775994f06af00dd43b182878e5699af55e11d9568351e5f77a1858c75