Malicious PDF — malware analysis report

Static analysis result for SHA-256 6057194572c808de…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 08:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e484cc09cb33835f5478ff4df133e96f SHA-1: 1419187f3c6c4cd02d6e6c1b52d2c1dbe82ef779 SHA-256: 6057194572c808deabafff74d16d2dde9d6e8f50f88add54dfb81e6938007b0f
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are likely disposable hosting. This suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://divodizain.ru/ckfinder/userfiles/files/43744514820.pdf
    • https://santa.my/images/users/00000000/files/wagizoxebefasatew.pdf
    • http://seasonmediagroup.com/pic/file/92375048118.pdf
    • http://vxclouds.com/userfiles/file/78095406540.pdf
    • http://www.jobibon.com/admin/userfiles/file/pukalogaxiwed.pdf
    • http://partnercable.com/files/79536775703.pdf
    • http://honghuibio.com/d/files/gegegi.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/loxarirosemapelarekulume.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/viwej.pdf
    • http://sakem.org/userfiles/files/lobixavexazudasurabizopo.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/77434005742.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51021536148.pdf
    • https://bangvetthuong.com/luutru/files/66168717282.pdf
    • http://princeverma.in/uploads/files/mozanusakiwidupikaguvi.pdf
    • http://nanumed.ro/uploads/files/61517250327.pdf
    • http://myslizdrave.com/soubory/sobomominirofuxerodafa.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/fekezezisupugepa.pdf
    • http://tw-jia.com/uploads/files/202109160004451217.pdf
    • http://www.findvoters.com/userfiles/file/misasikitugidamagexoniti.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c91d75cfa---60353830133.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nasabesesi.pdf
    • http://nandishoverseas.com/UserFiles/File/gisenevisij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=top+10+mobile+company+in+china
    • 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_off0000db1c.bin
bc4db9b74f7eab950493181c745d5fb06401aab94c5aa209057b756a9c4670e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 10664 bytes
font_01_sfnt_off0000f315.bin
63d658c1441a847651bc465095a9911f980591378a3905c2c60eab5b0f84a4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 17612 bytes
font_02_sfnt_off00012098.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes

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