Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9b276b9714f240…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 10:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf3dac3ba5e41c077e457c403d43b1d1 SHA-1: 7e028854894a7c28dfbf414e93c49c72cf4e764d SHA-256: 8e9b276b9714f2408a4106305768362432e7b23da5f9dbe26c631958024dee0e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://euforbiabulgaria.com/uploads/pages/files/wojamerelibe.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/bixowotewo.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/lozemalo.pdf
    • https://hotelgaric.com/upload/datoteke/75508331718.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/48644390138.pdf
    • https://martas.vodrsport.cz/uploads/files/biseda.pdf
    • http://www.kevimotor-rock.hu/files/files/tubaxadajed.pdf
    • http://ledseoul.com/userData/board/file/xebosexanuzabidozoduba.pdf
    • http://zavalinka.by/var/upload/file/86695049043.pdf
    • https://braindevelopmentmaps.org/userfiles/files/lavofisesatiliwefedelikaw.pdf
    • http://stickerbarcode.com/file_media/file_image/file/58066795797.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/jukikozowa.pdf
    • http://hoteldazegliotorino.com/userfiles/files/ginoliv.pdf
    • http://kaiyudachem.com/filespath/files/20210911110915.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/2428295345.pdf
    • https://slezanie.eu/userfiles/file/juwotivimoturidevokipadid.pdf
    • http://happinessgown.com/upload/users/files/lebunetabopubapixisum.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210910_052615295AF59133.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/xepofidixanelix.pdf
    • https://jamisonfurnace.ca/userfiles/files/defisopebevopegipipixixe.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/57956310437.pdf
    • https://gymlesgeants.com/upload/editor/file/puzuxo.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/sivilefog.pdf
    • http://bjqyms.com/filespath/files/20210902020634.pdf
    • https://sanruouvang.net/images/uploaded/file/vigokejajirirukir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rf+2012+mod+apk
    • 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_off0000cb40.bin
4c3766ecf3340954ab7019670eb32b0ab861a4cbd99328539accfdf933ab3340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB40 17588 bytes
font_01_sfnt_off0000f913.bin
100533be657c405877143ddf098fa2d52077a39da808bed0fb2408bea17867ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10348 bytes
font_02_sfnt_off00011083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 16792 bytes

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