Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d501019dbdeffcc…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 16:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59b3d64c1ca13fa1dcba107b6c97ea51 SHA-1: 5ce7f97e0e3e29bc088ea70e92a8a57e44a7c11e SHA-256: 8d501019dbdeffccfa1ca819e8b4d12b65315c338b196d5d36ab48e66ac462b4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=tema+line+gratis+iphone
    • https://omprintandpack.com/userfiles/file/97193446567.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/sunumab.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376aba5180c---kowitu.pdf
    • https://olterus.org/contents/files/9288617201.pdf
    • http://thankschicken.com/uploads/files/gujinukit.pdf
    • https://maymac.info/userfiles/file/xawekaduguxavimenukaza.pdf
    • http://www.vegagastro.pl/upload/file/bexitoga.pdf
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/30691295074.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/11866756184.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/27272919691.pdf
    • https://hongmao.tw/uploads/files/202109190656433800.pdf
    • http://cariboohose.com/userfiles/file/96001356348.pdf
    • http://viettruss.com/upload/file/36942358618.pdf
    • http://niktid.ru/userfiles/file/41062684473.pdf
    • http://belv.ru/userfiles/file/tovovabojadederefe.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/27754824559.pdf
    • http://nuocmambason.com/upload/fckimagesfile/6ef87455b7612ada7002092d18437aab.pdf
    • http://beautybybelief.com/admin/images/file/16874351840.pdf
    • http://hotel-ambassador-nice.com/upload/files/63808918767.pdf
    • https://anitt.in/ckfinder/userfiles/files/badeba.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/35817038491.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/67201549587.pdf
    • http://tw-tms.com/uploadpic/xw/files/92267876175.pdf
    • http://aan.kz/ckfinder/userfiles/files/givosezojazowi.pdf
    • http://webbolt.fono.hu/data/editorfile/wajek.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/venekejufirubudojoj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ba.bin
6099eb851f62948bdf919f672d6cbd47bddcc69ad3d32384e2b2b2ad2ef5d3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 17204 bytes
font_01_sfnt_off0000f38f.bin
c3edeff8340f66d006854b7d46a7f0c040e339ec4045af009b34e7fb2b6dc0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10664 bytes
font_02_sfnt_off00010bbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes

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