Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2317549b89af01c…

MALICIOUS

PDF

70.9 KB Created: 2021-01-03 05:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ef922213dcfac31a9fdf0c7f65b5c16f SHA-1: 94d155540928888d6641856d7354067a81f71b36 SHA-256: a2317549b89af01cdd962d2bf65ea62be7959d830996d93d3b23772f262f3183
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic. The primary URL, 'https://trafffi.ru/aws?utm_term=post+cardiac+arrest+hypothermia+guidelines', suggests a lure related to medical information. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or a trojan delivery mechanism. No scripts were extracted, but the PDF structure itself facilitates the link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=post+cardiac+arrest+hypothermia+guidelines PDF link annotation
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/lenazirujadig-sodolabido-rudeze-pofawedusisuti.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/2fb527d06c72fb2.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/7753952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_5fe6b2eec87d4.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/756413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f9d1dda67fe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6255c800-4fb7-43b5-ba09-9c1230096682/viasat_surfbeam_2_satellite_modem_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c8325b-657a-4c58-a60d-e563575293e2/nosorubid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ebd4bb-3cc0-42ee-8f15-7087875ea9fe/vekage.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/74110643632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8e891f-a04a-4297-8500-4a8717a48087/sonic_blade_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/lekeka.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/98176621175.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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 5588 bytes
SHA-256: 0c1e2d2152139a75b6e08870a0fbd65d2cbf52477a286b5a1a09df07a7e9a991
font_01_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 10420 bytes
SHA-256: 6d2081a30477709ddc04e992d1d170adb5240498c528571df3de3a08ed0ed0ec

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