Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5193a5a065a937…

MALICIOUS

PDF

73.4 KB Created: 2020-11-20 01:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95e245b7036065bce4a2d352b81ca7e2 SHA-1: 3c90037af9dda12cc3aa7e2b750e88a5e0cb2cd3 SHA-256: 6a5193a5a065a937ffc689cbf0e2f1ebb074f120163b306024cedf02b352d033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://trafffe.ru/123?utm_term=wanted+pdf+notes', is flagged as unknown reputation and is likely the malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=wanted+pdf+notes PDF link annotation
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/3c542cb.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/detovemo_jisajanabarazev_xilotapavebanad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5c44ae94-e82a-4f9d-90c2-855897f657fb/may_20_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/arifureta_light_novel_volume_5.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/83553149342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f059cf8-8d59-45a4-a83f-8cdc9b059ead/96036183839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67e99a4-63a6-4796-9609-9041b9c176af/48009369988.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/850505049.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/st_bedes_lanchester_sixth_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/98627473837.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/sweet_babies_images_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4faaa4eb-aa7e-4275-98f9-eabeefb6ec09/worazixamuvexige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1350e48-c8e7-4e75-a70d-3f41851d0684/44349463982.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/nugavisanuwoxaz.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 4660 bytes
SHA-256: 326f3e1b6f13dc9ba873fd93a3bdbd08720384753d64033ef3614b29f2f00e0d
font_02_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 11372 bytes
SHA-256: f3cd8f5a506f3b6e11b50b5ae91ae88f18bfeb61b4b16da0c1fc8fd589450186
font_03_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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