Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5e16b181b78772…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 09:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94102b6981e0c7192a71b8d0bdde090 SHA-1: 6fb341a058b48a9b852be98e158fe25ed5b13864 SHA-256: 2e5e16b181b787720a3929dd4f121cdb0ae8997e16f3932addf85a80e15b93d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, with high confidence. Heuristics indicate it functions as a link farm, embedding a large number of external URIs, many of which are hosted on potentially disposable domains. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crawfordpoint-ca.seeninherd.com/files/mifubazo.pdf
    • http://gmkms.net/upfile_editor/2021/files/fozopevifewul.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/dobegabegudutazubimulibij.pdf
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/96029776039.pdf
    • http://ventexevent.se/uploads/file/lifetapupemam.pdf
    • http://e68momo.com/shopadmin/upload/files/nilimebigeziso.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d34f1c984---zetagagulafe.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_AED92494A71777F1.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/33399515364.pdf
    • http://sanzmendia.com/userfiles/files/lakojufofigakul.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/lanupoxalonituvegasoruduf.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/nuvikezaxitofizunaxuguf.pdf
    • https://kentacademymiango.com/userfiles/file/nesodonupireberuxibori.pdf
    • https://intrigantka.ru/images/userfiles/file/69444295371.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109181808221284.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/44125212200.pdf
    • http://greatnice.club/updatefiles/file/33270270600.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/71144142315.pdf
    • https://faktxeber.ru/resimler/files/24322062074.pdf
    • https://speak82.com/_UploadFile/Images/file/mitutogupiloguni.pdf
    • https://tese.in/ckfinder/userfiles/files/65417939664.pdf
    • http://polkovnik.su/upload/file/72353199761.pdf
    • http://ototavandosemesi.com/resimler/file/28761594255.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+mobile+price+in+pakistan+range+4000+to+5000
    • 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_off0000b0c2.bin
ec6d3eba5b46124cba7f463e73a3d572641e7ae840da27559be2facc7e2861f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C2 18556 bytes
font_01_sfnt_off0000e0a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 16792 bytes
font_02_sfnt_off0000f8ba.bin
b0f07b9e215d4472ee19698681878b552426d37749c313f42cdfc468926ab4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 11404 bytes

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