Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dca7e00db9d05c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 19:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46575d6822a1402556e823df2e96bc7d SHA-1: e7b804b542870717d8c8f95e2849f70b4d4a3d09 SHA-256: a0dca7e00db9d05cf53294497d1df488e16c726b7298bfe928850f2a5c5285bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://crysiq.ru/uplcv?utm_term=android+email+notifications+not+working PDF link annotation
    • http://rockefellersgold.hu/editor_up/velanusimujoxezerowafowax.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/36712230537.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/38991569781.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/mopojajagabebuba.pdfIn PDF document text
    • http://elma1.ru/!upload/files/futozefovejukowosel.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/77668222905.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/pidunuladezojorekatonam.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092700584369.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/82580467525.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/64811793621.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/40923329896.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109131502574409.pdfIn PDF document text
    • http://schubert-hh.de/image/file/93659800153.pdfIn PDF document text
    • http://juha.be/_files/file/99901545616.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/zobagezomabizadujovixados.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133eac6c8ac8---60526063193.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/32390821286.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tuxasoravez.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/wumarafizodes.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/62579683178.pdfIn PDF document text
    • https://eslms.com/userfiles/file/2497792660.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/75698501634.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gotexofididosim.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428a0bcd198---73532259863.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xidokosenupefujokel.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/36143780886.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_off0000b97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 10976 bytes
SHA-256: 2e6aaecf55efbb4e8cadb2f6b2b289588eeab28aea5ad55039da6b84096789c0
font_02_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 17216 bytes
SHA-256: 08b43006d750438ff8e0ff9c59fa49b2b655f71f8b3e70f9fd663da71faf9dcb