Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2b304166d560cf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 05:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b7b8dc4db6e991512eea39032b543a8 SHA-1: bbd33e19e771bb013b59854b328130f2b0592749 SHA-256: 1a2b304166d560cf8d2a095fd02ea4cd518ed86bc35cd7d58738119f79e9b3c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it contains numerous links to potentially disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://rockhousemethod.com/ckfinder/userfiles/files/53171830693.pdf In PDF document text
    • https://tgvl.in/uploads/fck/files/13798503486.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/7646948028.pdfIn PDF document text
    • https://arerp.kr/data/file///nanol.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wodamuxamajo.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/68367539111.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/ditilubegozekaj.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobujenedogu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/5287868362.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/ladikaja.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/fuzogu.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/padamewapitevelaluf.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/77837985235.pdfIn PDF document text
    • https://serka.com/serka/upload/files/29261488880.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/malerulawupikuvakumemi.pdfIn PDF document text
    • https://kapefashion.com/files/files/38542549160.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/55557367837.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/muxexoxipupijafe.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/39633376315.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/67373379315.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bufugozexu.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/94591637665.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/96896480465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vpn+disconnects+ethernet+androidPDF 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_off0000bbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE9 17464 bytes
SHA-256: 1fe5dc51d72cdda91a8281db1808921333f5588fe12b0c69fe42dfb09a762331
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10532 bytes
SHA-256: 03a60d2103a02f50c9465e2f181e12b1b02ad2450bf38fa24e7358c1db83b64f
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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