Malicious PDF — malware analysis report

Static analysis result for SHA-256 15649fb9f9c3ee48…

MALICIOUS

PDF

75.7 KB Created: 2021-02-21 21:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1e4ab974f88f4d1bed386df5f7a37088 SHA-1: 69b288b4950ef2f50d7761d7a8c97ebebbc51b27 SHA-256: 15649fb9f9c3ee4862e6cf097191b00a01706a9552d461aac3d8d32dc535b660
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being `https://maypoin.ru/strik?utm_term=sinkmaster+750+removal`. ClamAV detection and ML classification strongly indicate maliciousness. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute actions, such as downloading further payloads or redirecting users to malicious 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://maypoin.ru/strik?utm_term=sinkmaster+750+removal PDF link annotation
    • http://dasuwupozu.22web.org/powerpoint_template_technology_roadmap.pdfIn PDF document text
    • http://nagetav.22web.org/burlington_ontario_weather_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_6029907293e9d.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/dojegupizufub.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/asean_china_free_trade_agreement.pdfIn PDF document text
    • https://vewuwoxefi.weebly.com/uploads/1/3/1/3/131379256/bibufibijis.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/takateg/adobe_photoshop_lightroom_6._14.pdfIn PDF document text
    • http://tinulelor.rf.gd/voiced_and_voiceless_sounds_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/gifavorokixopamezew.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/dukozugajezuruluk.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/how_to_put_pictures_on_top_of_pictures_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/church_of_scotland_safeguarding_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/bluetooth_for_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/96287853151.pdfIn PDF document text
    • http://savekuf.rf.gd/27712470551.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5404 bytes
SHA-256: ff180857e8e124111433bdc43c4d065882d68ca9a49cafaa193fbeff2c3c7ab0
font_01_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 11448 bytes
SHA-256: 4c4bf9d487e6b21fec1d741cce71412c96876d0c17feb86b7acf4d3ebb5179e7

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