Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a11765b1ef8a0b7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 14:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b1791ba400e4886064891bc0711f523 SHA-1: 65bd230815188098a45d7db33a80ca0ddad021b0 SHA-256: 0a11765b1ef8a0b7dfd25c2d47c31e3c30596b9df4bc4024fa3f7ebf15e3a824
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to a malicious URL, which then serves a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=how+to+set+parental+controls+on+onn+tablet PDF link annotation
    • http://panda-es.tokyo/yamituki-n/uploads/files/37734288819.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegudatudefililomudiki.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/43783194799.pdfIn PDF document text
    • http://short-story.ru/upload/file/85763025439.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/xufodi.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/gemamopebuve.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091416161793.pdfIn PDF document text
    • https://majubesar.net/contents/files/12872916680.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/58207862542.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/sesemesomazesafarofexewov.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/goginukefefevumego.pdfIn PDF document text
    • http://www.polni.si/Images/files/fekuxifiwobobizibusum.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109131004169555.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/47325810715.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/xaranonefixinure.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/61071513442.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f851e7ad7---89822368721.pdfIn PDF document text
    • https://cet.sk/res/file/23390627615.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/78200588095.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/lofixebomoribuvonixug.pdfIn PDF document text
    • http://enewind.com/pliki/file/72261503384.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bijes.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/29708395905.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/kalotujedefogerutarifu.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/tutimipopofer.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10492 bytes
SHA-256: fb7a53e29324c9fb55eb50f9aa14f7ebda6216ffce74c7d10a808ba2929ce9e3
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 17560 bytes
SHA-256: 070fc2ff08f8a50b57796805c4a2850fbdbe92a6055ed79bb7e97fda0b309ca2