Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81682c22651fa75…

MALICIOUS

PDF

70.9 KB Created: 2020-12-21 22:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8706e13c367b37ae607ee86566df7e1b SHA-1: 930639dbf473ec2831570b7f29acf3f43285bc2b SHA-256: f81682c22651fa7513765801cb990008f8d7c0790a214b69a44c6d4ca67d888d
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing and trojan threat. It contains a link farm with numerous external PDF links, including one to 'traffset.ru', suggesting an attempt to drive traffic or distribute further payloads. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to deceive users, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/strik?utm_term=tollywood+telugu+ringtones+free+download+love PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f9116dfb5353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5fa484be6133e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5f91be711f46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f8ea259a5a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fdab718314f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fdd6869b03b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5fa622bd3a82e.pdfIn PDF document text
    • https://gowexafej.weebly.com/uploads/1/3/4/6/134621848/fekemibot_napukalatezas_vulim_zulojasakilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_5fd95bd248adb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://static1.squarespace.com/static/5fce13cb3775b77c105e55f3/t/5fd75d200f11661d4c49fc53/1607949601136/15922610624.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfeb102bbd74065800e14d/t/5fc3008164571256549f735c/1606615170919/la_gran_aventura_de_alejandro_answer_key_chapter_3.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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 5280 bytes
SHA-256: c6acd6dc6a9fead5ec4e66659925fe24ff1e7a6b1683a9d011ad977ff63df4da
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 5588 bytes
SHA-256: 31059bec760adaba80b48f378bfd173e98d761049d95e09fbe04b2adc12a0412
font_02_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 10424 bytes
SHA-256: 596afe741744397a05c8ee93da1ad661c2d833a038c5519dce74f581f0e0ec27

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