Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa25a7553d246f46…

MALICIOUS

PDF

92.1 KB Created: 2021-01-06 11:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d38ddff236033eacfd2e914e74357e48 SHA-1: 963b1f1e17e0bed200a25fe527191b738df59517 SHA-256: aa25a7553d246f469259f587c5c94bfa538292304d6165bcbc12f4aa67534a90
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://traffine.ru/aws?utm_term=english+proficiency+test+with+answers+pdf+deped`. Heuristics indicate a link farm and a ML classifier strongly flagged the document as malicious. The document body, though partially obfuscated, suggests a lure related to an 'English proficiency test', aligning with phishing or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=english+proficiency+test+with+answers+pdf+deped In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fa411405bc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f87de552dd79.pdfIn PDF document text
    • https://buwirudoxux.weebly.com/uploads/1/3/4/5/134597973/2312686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fb458787fb31.pdfIn PDF document text
    • https://muledejudo.weebly.com/uploads/1/3/4/8/134888896/dozapasuvetawotelel.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/farefasejikap/receita_de_bolo_formigueiro_simples_de_liquidificador.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/redupixasovogesol.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/ambulatory_blood_pressure_monitoring_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/72508722953.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/symphonized_headphones_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/large_leaf_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/cantico_di_frate_sole_analisi.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/cyclophosphamide_vasculitis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/73003639081.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/keurig_coffee_maker_manual_k50.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_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 5356 bytes
SHA-256: e0630e94807c7dedc16c36e4720435d13ffc2eff02f647b9180ee1a8f4e7e857
font_01_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 11388 bytes
SHA-256: 3d6496a0848a30ce509bbb30bf45cbae653eab7ebe644f8963d03da05bcac8fb
font_02_sfnt_off000154ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.