Malicious PDF — malware analysis report

Static analysis result for SHA-256 106f5dffbf197b4d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 23:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2dc575ad5083791424f7b61d12f2122 SHA-1: e2220ceb55f4ac415fa39ed4e4324dd1e2437955 SHA-256: 106f5dffbf197b4d384a42465f31d028bec8bfe3ce4bb5a17572bb208de366fe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thehedgerowchronicles.com/ckfinder/userfiles/files/74997203008.pdf
    • http://audiohrestomatiya.ru/content/file/kumutujanezadevijawavo.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/galave.pdf
    • http://megatex-plast.ru/pub/file/4787081453.pdf
    • http://ageofwonders.buka.ru/sadm_files/gizovafijorijemobag.pdf
    • http://www.kickcommerce.com/userfiles/file/38632657569.pdf
    • https://bagstyle.uz/images/file/gujadesitufan.pdf
    • http://lynxauto.ru/userfiles/file/27558838757.pdf
    • http://myucpb.net/userfiles/file/wutulegusel.pdf
    • http://friulanapanini.com/images/file/9612243274.pdf
    • http://waetsukai.jp/system/ckfinder/userfiles/files/56663746520.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/64331190798.pdf
    • https://inprovituruguay.com/ckfinder/userfiles/files/mimolotewixulomoxif.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/riditosadomubazamemeziki.pdf
    • http://shyjjc.com/v15/Upload/file/20219171242137061.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/nipenejapa.pdf
    • https://rlmahtani.com/userfiles/files/kejubulujo.pdf
    • https://h16hr15k-h19hr37urn.com/contents/files/gukajefesajonotoda.pdf
    • http://noithatmyhome.com/img/files/44093150892.pdf
    • http://werder-ritter.de/UserFiles/File/dubuzexawunape.pdf
    • https://calienglish.com/ckfinder/images_store/files/jivitinasalog.pdf
    • http://domoticasociale.it/immaginiNewsletter/file/sotujikumifavefalegu.pdf
    • http://bonezi.morefriendship.com/upload/files/31430126505.pdf
    • http://wienbildarchiv.com/upload_files/files/xuvegotogegatakekudib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+idm+on+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_off0000ebde.bin
72500f23c1db45fd771832c7398e8981bec92d91ca95ee0f9d4d22602a7ebef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 17296 bytes
font_01_sfnt_off0001187b.bin
fdc9ee885f49ff3546fe4e40d2deae5db24934ba8fc7ec77a97db8ac4589aa13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 10540 bytes
font_02_sfnt_off00013084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16792 bytes

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