Malicious PDF — malware analysis report

Static analysis result for SHA-256 b825ad4cb47f2c35…

MALICIOUS

PDF

80.6 KB Created: 2021-02-06 01:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 15e7cc9308527c3da64ab1104a5ff324 SHA-1: f24e3a3099fb750b581c3adbbe07f624d99bcaf2 SHA-256: b825ad4cb47f2c35ae562faa43673b307644e8b609976d8688459c6934d765f9
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with critical heuristics indicating it's a malicious redirector and part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=rudy+enb+sse+cathedral+weathers In PDF document text
    • https://cdn.sqhk.co/lotivadafe/Mb4jiii/public_hide_or_hunt_server_ip.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/kEjeH6Q/boku_online_casino.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/bc106c5347a5.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/f2673ab.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/icaheig/44219001933.pdfIn PDF document text
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/tosefetajudevabo.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/sheet_metal_gauge_to_millimeters.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/fqFhagg/train_station_railroad_transport_line_simulator.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/d58d3f99364.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedadokuti/goranuxuwiwavagadosesosog.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/74976323853.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/jakasonibij.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/apsc_full_form.pdfIn PDF document text
    • http://bukuzagalu.rf.gd/tuguxaso.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/circuit_training_function_notation_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/40027588854.pdfIn PDF document text
    • http://nonogopikizezed.rf.gd/pasipekijejedagisapi.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/portable_android_emulator_for_windows_10.pdfIn PDF document text
    • http://jigiwema.epizy.com/18397113829.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 5092 bytes
SHA-256: ac6e5987f042b6d9049a2e1a625a0e66f4a5d8e63040c1a52fa46e5f789e52e8
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 10664 bytes
SHA-256: 35a64f0ca0470a4d5697b439e02ef0d433fd005622ef2481c0d49b6f22f75050
font_02_sfnt_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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