Malicious PDF — malware analysis report

Static analysis result for SHA-256 e874ecf24ce3cd2c…

MALICIOUS

PDF

75.7 KB Created: 2020-12-31 19:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bf41a2b7aed6bfb240027918169ac7bf SHA-1: 383abfa3cb1ffc36d6f507a435f0cb07f15e8a28 SHA-256: e874ecf24ce3cd2cc67451a6026fa0b64d50701427bc9ebb59d24f2f6a285c5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the document is designed to host a large number of external links, with a primary example being https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/07ea0.pdf. The presence of external URIs like https://trafffi.ru/strik?utm_term=sad+black+wallpaper+boy further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=sad+black+wallpaper+boy PDF link annotation
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/07ea0.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/aJji2ja/61231079487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5feb5c711e0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fd2484921e83.pdfIn PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/7d881507e871c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fc72e4342afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5fbeb75161e26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fifuto/centurylink_prism_tv_channel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/19975939636.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/aprilaire_400_install_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/10873480182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3647ea9-b55f-47cb-beb2-f2044b2ed349/how_many_calories_in_gujarati_food.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/article_english_grammar_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/itunes_32_bit_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/4951930211.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 5392 bytes
SHA-256: 1fb7050546af7d18f6a6fa061f587716d6cc4a530bd51bb1faac8bb27ff5a71f
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10672 bytes
SHA-256: 20000489dd6075e3b4b52419405dbffb0cc32a9c1b163775db9fe976228117e4
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 17384 bytes
SHA-256: f6a6f40eec17b3efdd47fab1fb425ea515d9226d09f846f426fa0dfb1854462c

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