Malicious PDF — malware analysis report

Static analysis result for SHA-256 461e705f4d6690c2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 12:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d6ed25ce24cbe4c8fada2ac54defff1 SHA-1: 45c6d7bff2c8461c2eb152db4d3dd9c5bb8f7356 SHA-256: 461e705f4d6690c2a3642a194e79229bfb2a7a56e15accb5505769f40e09bf8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://philabc.ru/uplcv?utm_term=how+to+check+android+phone+ip+address PDF link annotation
    • http://efsanepin.com/calisma2/files/uploads/47685344619.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0e299103891d71615853e4406517c22e/68488110289.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/4623525676.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/nemizuxode.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/firogituwipuzex.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/donevejokuvowoxofoxo.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/fipepasobufitamoj.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/78686115049.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/siruxitimadazadomud.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/36338159415.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/kisofupewegurepobuwu.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vufoxejejenejuku.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/30764081999.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/66692263319.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vuxejorisutib.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/revakadesused.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rusuvaxipaxetosevizev.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/25899259795.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/gaxusebukowuzigaribusepad.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jejevivonobukofisuzezok.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210914_63896E1186543C1C.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/povafodox.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/86905536605.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/4080924514.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/dukisobet.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/vogales.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16516 bytes
SHA-256: eea797cf53b96356e7f03015d84ee22341b83895b4f6326eb1fb7640e0702623
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10732 bytes
SHA-256: a42b6203365cff6e3673b7ac31e6fab59de6a21585ce2cd63f162fffb24b203c
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 18264 bytes
SHA-256: 98bd009df7c4eb8d18f9eed4c12c09c3ad7a307851ba7f97a1f8d1d6906409b8
font_03_sfnt_off000133b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1