Malicious PDF — malware analysis report

Static analysis result for SHA-256 827e9b68813f1cf2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 02:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63c8e423824eda8205af4afc34e8235c SHA-1: b30cbad412dd457ff6c93c35dcba1f070a13115b SHA-256: 827e9b68813f1cf2329d4190212dc5a59eed21a598244d3df411d5a662315756
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or credential harvesting attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://netiko.ge/img/Data/file/zavirobazuwamesibuzejak.pdf In PDF document text
    • http://abwcockeysville.com/uploads/files/13060295802.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/topajaganiwufaxa.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/70655594281.pdfIn PDF document text
    • http://fgosvo.ru/files/files/begifi.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908081748.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nikirarexurabipekuf.pdfIn PDF document text
    • https://svltv.in/userfiles/files/56930779722.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/45785545002.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/75717172611.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/lukosesedeguxiseke.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rewixirojuvufagopuseto.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/56612470675.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jemejaremit.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/44101197557.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jujubinumawaxawexetanobi.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/74225637475.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/54759090049.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109071324431911.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/belewowilefomilefopesurek.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/11880520576.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/11973990767.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/lazuxojim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=electric+trains+pro+apkPDF 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_off0000c643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10440 bytes
SHA-256: fe197a259254ceb55165934ba9aa5fa7031eb256caf3e34a0fa138736898048f
font_02_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 17336 bytes
SHA-256: 7964a732cfca58392bba36b4651f5ce778f86674bfcde1a8175b7941373933dc

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