Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6731bab1aaf2c4…

MALICIOUS

PDF

77.8 KB Created: 2020-11-26 07:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ffbfdd0015ec37661d991c77436de25b SHA-1: 122251c0f70bb5130a8556c22a50489e62ffc162 SHA-256: 3c6731bab1aaf2c4414ae0e35b7bfd96f087da9774656eafdc3bdc7674f1e6bd
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that suggests a software download lure.

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://trafffe.ru/123?utm_term=fhx+coc+server+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482218/normal_5fbc11b44df7f.pdfIn PDF document text
    • https://kasalaketowo.weebly.com/uploads/1/3/4/8/134871290/1616466.pdfIn PDF document text
    • https://zeradukiw.weebly.com/uploads/1/3/4/8/134883462/xakixod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fa871b18343c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_5fb577b5cbff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5fba7251b8b07.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/991d3df1-8d51-45e1-8b31-f3eed87cde76/ibid_ibidem_difference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce0cf91-b2e5-47b9-8243-208df967532e/how_to_spell_800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8130ef-f369-40a5-a58f-f01093de2b81/toyota_rav4_manual_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/avast_pro_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/lepowelizopitubefobunoruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95ae194-9455-4a82-995f-11abd3c9ad51/cbc_histria_ensino_mdio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b946f0c-0f8a-4b81-ac2b-1ff109c0a859/destiny_best_legendary_auto_rifle.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/ymca_berkeley_california.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/dinozunajerukabinoba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 12608 bytes
SHA-256: 29398b93a89c24f531babc66f5c1ba9c1c6cc5cbde66fddcdbefe5fd2f4b7982
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 5428 bytes
SHA-256: c703366d7796f0b7190873a1ab257081171d13be54e8443a5560e68567289e1f
font_02_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10512 bytes
SHA-256: 5aeceac3987d9e85295c2f9903b4fe10bec55562f51579349cfee77d2b951429

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