Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13b3a44bf706b31…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 01:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b490b89534a165171a12603f099c2953 SHA-1: 4d52f5b1e6665394eb6ab7d2831a429188440736 SHA-256: e13b3a44bf706b31779a50e6efebf86a5b6ca991a21a3a5c984bd36e9e27eb0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://turchifiltri.com/userfiles/files/59399622414.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/rekiredipowakulixumax.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/fapirikuxonarejoranoxor.pdf
    • https://vanrun-it.nl/userfiles/files/66820131534.pdf
    • https://jungleflightchiangmai.com/Uploads/files/mufesalatefaru.pdf
    • https://groupunsur4.com/contents/files/mumatiwamumamonawexozese.pdf
    • http://mrcookie.tw/upload/editor/file/161821237952.pdf
    • http://lafiestadelmoto.cz/files/file/zebunexoru.pdf
    • https://arhstroi.by/uploads/files/59850894995.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12cf30cfc---mibafepafewofeg.pdf
    • http://gramercy-grand.ru/files/file/powetip.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/nejeludiruvepowukosoxu.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/muvizogi.pdf
    • https://jobtiara.com/files/files/rukenabonofosaduwinop.pdf
    • http://gzafjc.com/uploadfile/files/22216104547.pdf
    • http://posicert.com/upload_fck/file/2021-9-11/20210911081732703553.pdf
    • https://europartner2.pl/uploads/31253041741.pdf
    • https://sfeerweter.nl/userfiles/files/43512569867.pdf
    • http://ingatlantv.tv/userfiles/files/82483820776.pdf
    • https://balaji-technology.com/userfiles/file/78203814378.pdf
    • http://njchemland.com/upload/files/rekudekenidurowexi.pdf
    • http://coachhouse.info/assets/file/63160727856.pdf
    • https://kakakmanis.com/contents/files/56133662142.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=harley+quinn+wallpaper+for+android
    • 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_off0000c0f0.bin
5b39effa23b558eb38265408c7a88fb286bf754ba29e932aa003cd3b1639b121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F0 10660 bytes
font_01_sfnt_off0000d932.bin
ee43f03e2742a91bcc7f09bdcdbe6b5cae5caf61d584aeb8d515535752413f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 17884 bytes
font_02_sfnt_off0001072c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16792 bytes

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