Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb61af625869636…

MALICIOUS

PDF

72.6 KB Created: 2021-03-18 02:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a1add3941fff5061de4cf67d3ae50ab6 SHA-1: 51b8a5c5918cd5e83426f2a0abedb12aa384b9fd SHA-256: bcb61af6258696363abcbabf9395192110c080b430ed643b0b75ceb5f70762d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://jottigo.ru/wix?keyword=unity+call+function+from+another+script', is flagged as suspicious. While no scripts were directly extracted, the PDF structure and the high number of outbound links suggest an attempt to redirect users to malicious or phishing sites, aligning with a spearphishing attachment tactic.

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://jottigo.ru/wix?keyword=unity+call+function+from+another+script PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464722/normal_60241ca840d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_6046feff21a9f.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/32725507737.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/jimozomezebisejuwaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_602f20e08913f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_5fe2bd7aa2ecd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_6008b13d53343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_6035d4748650f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_44bf39f631784261af3c2783085a88f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowejunef/dovuzewexenasutunu.pdfIn PDF document text
    • http://pavafisufopu.myartsonline.com/apache_web_server_tutorial_point.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/duxonavotafoda.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/empires_and_puzzles_level_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/48649090240.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/1000_point_nurgle_army_age_of_sigmar.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/can_you_calibrate_omron_blood_pressure.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_0f09364d8f7c43ada3838ad85b76c0ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/banomoya_video_mp4.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5348 bytes
SHA-256: 05ee2e7cc28e6b9bd562b2796a76e9d6b277a5397d09078cc93da41039bfd1dd
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 11516 bytes
SHA-256: 296afad20abd6e9f05a08b6f818f79441aba75ac6bb4edda940088bd3339f5ad

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