Malicious PDF — malware analysis report

Static analysis result for SHA-256 44218accef231136…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 14:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b4299a29f70c94bfa9bd819661ffec1 SHA-1: ff262f865dbab1b4adaf5c33e1af2e33d0d4b932 SHA-256: 44218accef2311368ca3f51274cebea944eed848a6b94099e59dc6024a605e54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=snapchat+song+lyrics+filter
    • http://dichvutheapec.com/upload/FCK/file/31909002168.pdf
    • https://aitalk.vn/upload/files/voxidevaw.pdf
    • http://sung1.com/upload/files/11501894650.pdf
    • http://ssp.by/var/upload/41411904698.pdf
    • https://granitabrasive.com/editor_up/29815127600.pdf
    • http://giaodantanthaison.com/Images_upload/files/kexinikekuvukawozuxavixi.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/tubukajirijerigize.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/nibagakitosubube.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/42463692717.pdf
    • https://bonaparte.cappencms.com/templates/files/rarokazefu.pdf
    • http://kargo-box.com/uploads/files/zeximo.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xavipenutugezikesudam.pdf
    • http://trevorhannant.com/91054041758.pdf
    • http://delve-cr.com/uploads/samikubosizoluvum.pdf
    • https://abofahed.com/userfiles/file/20462624531.pdf
    • http://wakabaeducation.com/userfiles/file/mevaladewodikuwifiba.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/panogazajuxanokemopo.pdf
    • https://keluargamimpi.com/contents/files/35984841653.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/rowuj.pdf
    • http://tagsu.com/attachments/fckattachments/file/tegopasod.pdf
    • https://travelone.ae/userfiles/files/27200050253.pdf
    • http://lokalsport.no/userfiles/file/76661416292.pdf
    • https://sakura-bashi.com/uploads/files/202109090658227837.pdf
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/48910339442.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_off0000e720.bin
2684fb194bd8f932feedd92f5158c5975e68c067618b5ab10f7fc7538f534a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10948 bytes
font_01_sfnt_off0001007b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 16792 bytes
font_02_sfnt_off0001188d.bin
f1b02a5d2c13054e6005fbd0e50cc0d2815ddcba545566180e5ba7ea339bdbd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 19864 bytes

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