Malicious PDF — malware analysis report

Static analysis result for SHA-256 24be812b6e365c02…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 05:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39274a46ff1fd5c99238398cf2277d48 SHA-1: 6089eae2a26963e05cbab7ddf974892ea5974868 SHA-256: 24be812b6e365c0239443f7d15c208d4600f60c6c73a7c9661f90c1eeab5350b
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://sochi-polyana.com/ckfinder/userfiles/files/3070201601.pdf In PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/94311534461.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/23858698862.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/44374666805.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8c89bed1---wuzovu.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630691581.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/21266378930.pdfIn PDF document text
    • http://islandpointfl.com/userimages/fulokirepobute.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/99119566864.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
    • http://swhos.com/upload/files/kadozisewa.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/70385646212.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109130607252468.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/setitig.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906160239.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/36474539013.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/99367042754.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mawonatibobamakovabelin.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/3256261461.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/retuzedimawuxomawasid.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/ziroroganowaroze.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/33586115.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/67218737475.pdfIn PDF document text
    • https://arerp.kr/data/file///gazopexukigixod.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/werodemakejivata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=on+off+switch+uiPDF link annotation
    • 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_off0000b79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79E 16360 bytes
SHA-256: 4a938bcbcf53a4e6bb00624ef466fbb8a4db6e1775213698811f3887f6d9f496
font_01_sfnt_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 21456 bytes
SHA-256: fa50a311039a80eb77e3fc122191d18cdcef8fc1afa49c00bd4b7528b5ffc271
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10204 bytes
SHA-256: e014b6591625f94da74210f82ad3c59ad4c578e886562fc3c96f9dafe4064908
font_03_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1