Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb99f3531dafea19…

MALICIOUS

PDF

68.0 KB Created: 2021-01-03 11:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 28cb6dab06d6c173a078d01dc877ebcd SHA-1: a6ede5c5ea78fe4154d19c15d98e94989eee11ab SHA-256: fb99f3531dafea19b8931a94039959b11bb76dd3f760ffcc1798165a52cfd88f
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to 'https://trafftec.ru/aws?utm_term=mathworksheets4kids+multiplication+squares', which is likely a phishing lure or a distribution point for further malicious activity. No scripts were extracted, but the PDF structure and heuristics suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafftec.ru/aws?utm_term=mathworksheets4kids+multiplication+squares PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f972a6e50dc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fefb4fc07ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_5f93be639ef7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fe710d02bb0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5feefe783f81b.pdfIn 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/ddf00d1d-a763-4e46-a0ba-25d0d273fcc4/ap_sachivalayam_merit_list_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c63b23-f278-43a1-af9e-cf98ad6b8d1b/zadixuxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10b1638-1579-48b7-9ba0-3158800fd4eb/gipuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9b5772-029e-40ca-8e20-3fba94d58734/53328119736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f415c3ef-952b-44b3-a72e-b9266d316225/jarorurujesedadu.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/mobile_packet_backbone_network.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/14443290787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b577607-788f-4049-810c-69f2fbd03428/tu_chand_hai_poonam_ka_mp3_song.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 5688 bytes
SHA-256: 264dfcf721786e50e3907526e1c1bcdc269af5b79df393ce3718dcf008c0e00e
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 9940 bytes
SHA-256: dea4d08e660c95f07e211358301fec528d76d807562351b0950f4ee7af91ee37

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