Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db6600b8c67cba8…

MALICIOUS

PDF

62.8 KB Created: 2020-12-21 01:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ec963f5c8a5b2053346d421e462604b SHA-1: b8c17da2148e50f910130ab489d7b8b8454048e1 SHA-256: 6db6600b8c67cba8c5a0174fd9e4104dd724183f08b0b094f3ae3fac646ac05a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets, but one prominent link to 'traffset.ru' is identified as a redirector for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/aws?utm_term=lookup+function+in+report+builder+3.+0 PDF link annotation
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/medaxivojoke.pdfIn PDF document text
    • https://valogasode.weebly.com/uploads/1/3/4/3/134320371/ganepewamakat_tifoxewulaf_popija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_5fa3048769f9c.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/4637828.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/vodaxanilixezal_sosokubewexuzup_xesiv.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/pafiganovavi/chicago_format_purdue_owl.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/standard_form_to_expanded_form_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/john_deere_shop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/67846894539.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/candlewick_lake_fishing_report.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_off0000b81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81F 5244 bytes
SHA-256: c43a7025b563366a542a39b99bb148a62da2750daed4d40589ffc57e89dfca5e
font_01_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 10800 bytes
SHA-256: 6625d8c133ed357d9ed22511727397be8d15a7846db9d25f9bbc5dc0e4e99f7c