Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3141ae9337d31a…

MALICIOUS

PDF

81.5 KB Created: 2020-11-25 06:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dbf1c686b082361e25dd611d97d63cb5 SHA-1: 14e4f885700688693edbe1541752512944b29e9a SHA-256: 0f3141ae9337d31afe4c86e14b7d22af022e25caa9f4e4170a3d2cd1b5e77c0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://trafficel.ru/aws?utm_term=tamil+smoking+status', is flagged as suspicious. The ML classifier and ClamAV also indicate maliciousness, suggesting the document is designed to redirect users to potentially harmful sites, possibly as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://trafficel.ru/aws?utm_term=tamil+smoking+status PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f897fc87ab25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f8bb4d633258.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/3029578.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74632918-ad5e-4f5a-bdfd-e10e506dff84/nufifaxajubiniwuvojad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a278587-3570-4da3-be7e-b2091583ffa3/16_gauge_earrings_for_cartilage.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/zizut.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/37324431905.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/7085260913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7bf7b41-3966-4e5e-8f78-b0d1b8bcfa44/vixemekozililop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6dd960-00c0-49d2-9b0e-072ba07d4e1a/xodukoduravarisejedig.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/brad_taylor_books_pike_logan.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/dunona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1a10f5-f3b7-4820-a377-abed3818b50b/dd_5e_way_of_the_four_elements_monk.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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e56f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE56F 15092 bytes
SHA-256: eb80fd061e3158fb1fbc0e0ccfc37a8f79587344f7fb25a62558fbfcf17484df
font_00_sfnt_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 6384 bytes
SHA-256: d84f0b41e921a5fbb59c6000c45deae92b494ed9e0760429eb35bde61d0b8459
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 4924 bytes
SHA-256: d71cb43a681d9a64dc703de838aea17bd38522df913ff1589a132f5c078cbf5f
font_03_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 1944 bytes
SHA-256: 4a7a17ef0ba0b87d3101fb253220c21ebf70d31c9b38729fcc60725578a726a3
font_04_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 11144 bytes
SHA-256: e7bff7833ec827f27cd4d817145ff88eab3dec81a023949f62f608ae55c79393

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