Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aece91f34f2993…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 12:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6142234eac717880947992bb4fcd8f11 SHA-1: f40553de3f6c677350f101c618ded0c269008793 SHA-256: 17aece91f34f2993f53db427473216b535dfefde6dcf8b887a1be579f24b0706
146 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs pointing to potentially disposable domains and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to external sites. The 'SE_QR_LURE' heuristic indicates the document may also instruct users to scan a QR code, further reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oishisushigd.com/uploads/files/16430792592.pdf
    • http://katela.net/userData/board/file/kaferugodawabakaw.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021092104455073499.pdf
    • https://rivieresoceanie.com/userfiles/file/91924322634.pdf
    • http://soupworld.de/upload/file/78230464164.pdf
    • https://sporyolu.com/resimler/files/jowobabixovexenasudiboxu.pdf
    • https://biocoils.com/img/file/vidom.pdf
    • http://akkoryazilim.com/userfiles/file/voxival.pdf
    • http://kamakuralosgatos.com/uploads/files/3856065239.pdf
    • https://conrays.ru/f/data/98276612842.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210905_C1409CA9BFC86EAE.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2863db248c093ccaafa1579fd83755be/16674636473.pdf
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/91274913659.pdf
    • https://thietbixanh.net/uploads/files/45146948456.pdf
    • https://ivantomanov.com/userfiles/file/povekadakukire.pdf
    • http://shyjjc.com/v15/Upload/file/20219121642116791.pdf
    • http://gamjagolla.com/uploads/files/fijijetibidikapad.pdf
    • http://bjxbw.cn/userfiles/file/jimeguri.pdf
    • http://noahmission.org/dataroom/file/xunalofovumipozafisek.pdf
    • http://stoka-saarlouis.de/userfiles/file/29690364535.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149d3abeb781---65210601525.pdf
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/26118720953.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zovimiki.pdf
    • http://stelmart.ru/userfiles/file/50605805483.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=qr+code+rw+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_off0000d9d9.bin
c1584f7f6a1592c0c5eb2b683e55f6b5aaf73895bde5cd088d680c7fd8257600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 17664 bytes
font_01_sfnt_off000107f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 16792 bytes
font_02_sfnt_off00012009.bin
f66d1b7320847ca298857fdb0f8262f4d994a6e36edcef31095010b91a9025a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 10236 bytes

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