Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dbd85255e2f768…

MALICIOUS

PDF

80.6 KB Created: 2022-05-31 11:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 3aa62cbea92c3748684d281612a6ad80 SHA-1: c46c3614f0c0cf58feb82c5f3a85a48c64b360e6 SHA-256: e2dbd85255e2f768c3d8aa4d00f654095b9217870cea98f850e75900c004b8c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yoyep.co.za/YmrXLWy8?keyword=ecg%20made%20easy%20book%20pdf%20files%20online%20free%20online
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/9960168.pdf
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/3304100.pdf
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/jamofusi.pdf
    • https://fosezuwupilure.weebly.com/uploads/1/3/4/1/134132817/845119.pdf
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/7525165.pdf
    • https://bujivopipagafo.weebly.com/uploads/1/3/5/3/135321681/sageroge_wupifi_kemewini.pdf
    • https://sokexuwog.weebly.com/uploads/1/3/4/3/134351495/5453330.pdf
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/nonabar.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1624575cd27008---66860740853.pdf
    • https://thietbivesinhsonhoa.com/webroot/img/files/60810749802.pdf
    • https://kibibobufusasi.weebly.com/uploads/1/3/4/6/134643218/6719461.pdf
    • https://ruweveti.weebly.com/uploads/1/3/1/3/131379789/6261423.pdf
    • http://divapharma.com/uploaded/file/51911498396.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/totarufinibasagapeputoxa.pdf
    • https://www.sudicobank.com/ckfinder/userfiles/files/nexokuxava.pdf
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/gawaziv.pdf
    • https://kotugupevexaxis.weebly.com/uploads/1/3/4/4/134493549/dukabidojizudifik.pdf
    • https://mepolelo.weebly.com/uploads/1/3/4/6/134626310/4750149.pdf
    • https://www.kossuth-csepel.hu/inc/kcfinder/upload/files/89954628770.pdf
    • https://tadozowilafozu.weebly.com/uploads/1/3/4/7/134710515/daluwelapozuvuj-kupemugem-gutekum.pdf
    • https://sutevanu.weebly.com/uploads/1/3/4/7/134770908/25acf2d1837.pdf
    • https://xofunulajadapo.weebly.com/uploads/1/4/1/5/141524191/8ccaa757f.pdf
    • https://zovuzutozureje.weebly.com/uploads/1/3/0/7/130739602/3fec8b.pdf
    • https://nnt52.ru/userfiles/file/25505335028.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d254.bin
d48f272657ad4c32d8d71e23fd4774ddf8dc7bfe3474a729905b462112debcfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 17252 bytes
font_01_sfnt_off0000ff6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 16792 bytes
font_02_sfnt_off00011781.bin
4d91392fbcbcf4afe4aab8568506d24256e134685230071b17b3218e423d05f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 11196 bytes