Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a3e742909c9e6a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 23:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf614a2a838990f0888706dbd6656ca4 SHA-1: 884690534a7883a831506193f6e8b5d5b31b3bef SHA-256: a9a3e742909c9e6ad68cfab6d602a25f5fe1bc008cbb0e60c3e49e0d980ad1e5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://elsekmont.eu/userfiles/file/tekedapakarofis.pdf
    • http://kxzyjy.com/CKEdit/upload/files/xulekewubogabeka.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o40fm0bb9tu3i7j3ppnl2eo3p2/50140996251.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4fb4d52d---salenalezo.pdf
    • http://munnarteabungalows.com/userfiles/file/62829083116.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_171751.pdf
    • http://bayernglobal.de/userVZ/file/duvaxarem.pdf
    • http://lagunaapartman.hu/images/user/file/47257588809.pdf
    • http://coachhouse.info/assets/file/12548546728.pdf
    • http://ozgu-yapi.com/firma/files/79950181844.pdf
    • http://inica.org/files/file///jidavomivajijafesuvovemi.pdf
    • http://rococosofa.com/files/files/xazidarile.pdf
    • https://maggies-handmade.com/UserFiles/files/98436800872.pdf
    • https://szekszardportal.hu/userfiles/file/18471741664.pdf
    • http://olynskiconstruction.com/pics/file/xinilogepakuneveta.pdf
    • https://thucphamtruongxanh.com/Upload/files/64450470865.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/sedilezujuletosijo.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/fizilofodededowag.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/duzuba.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/gebepuwotus.pdf
    • https://ddnepal.com/assets/userfiles/files/zojeridagaz.pdf
    • http://ashole.hu/UserFiles/File/gogikoramopinulugofogexus.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/teluvejumamori.pdf
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/56649981071.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+hidden+apps+on+your+phone
    • 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_off0000d6c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
font_01_sfnt_off0000eee0.bin
491b626dc1ebbc3ea73357216ce4e7b87fb828d7c6999a4ad237083ed8a83061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10840 bytes
font_02_sfnt_off000107d8.bin
673f7800f53b561d448ffe2969cbd50ccf29fff5b5cc30475a5dffb367232023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 17256 bytes

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