Malicious PDF — malware analysis report

Static analysis result for SHA-256 2911fe0f6dcb45d8…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 03:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 675e0ad79073025ff449301ccca028a6 SHA-1: c2d7da308798107254eb7473f274770b5c3b72bc SHA-256: 2911fe0f6dcb45d8bbda34cdcd721548c76aa1bd4660d1476782ecd8c882ff2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or scam campaign. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=otg+meaning+in+mobile+phone PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cc55933a9e8ac8987818354ca135a3e5/xigijotaw.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rupefe.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xenevakowozowivurewu.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rivubujusija.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/24916596715.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/madokemobakir.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/51658826252.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/sixigazelokuvanotowokazew.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/52267910644.pdfIn PDF document text
    • http://fgosvo.ru/files/files/54264624413.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/9284219037.pdfIn PDF document text
    • http://clickvay.com/upload/files/35723312376.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/3496732968.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/nokuse.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/37448617297.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613228da484eb---7020131063.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/xoxutobipigufuw.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/wepupudekomuxevomudasuxe.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/daderajixiteg.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/timugapikiga.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907112330914486.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/radovozanixovonugiwiz.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/venediribateta.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 10596 bytes
SHA-256: ad64e000b08bc08bd1b0d17e6af68846e9b88734e200a1b1978574755276a572
font_01_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 17248 bytes
SHA-256: e07abc55ffea3aa91003e92aa84d06579107ca858447a2603559ba3c3098e92b
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1