Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b16a448fe26619…

MALICIOUS

PDF

69.0 KB Created: 2020-11-20 11:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2d4d108bb3b6000d165a52c3c47cf05c SHA-1: 1ddd4840e1db5b251f1133277ebe16db6d53388b SHA-256: 50b16a448fe26619b80456553f38dd1a5da7aaeafc16154a2bf7ebd93cf58296
204 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a malicious link. The embedded URL `https://trafftec.ru/aws?utm_term=cleaning+subcontractor+agreement+template+australia` and a linked PDF `https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf` are identified as part of this scheme. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafftec.ru/aws?utm_term=cleaning+subcontractor+agreement+template+australia PDF link annotation
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5fa4ab2c22aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5f904fb489de1.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/f8c7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_5f95f83168136.pdfIn PDF document text
    • https://rufewukel.weebly.com/uploads/1/3/4/5/134599372/6743936.pdfIn PDF document text
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/pawubege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5f939c9b8e454.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/deronamosavolizogof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5fb5a31d8a5d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f8c9fd05274b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_5fa7c766466fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5f9efe3ea3af1.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/92ae5102-3478-4b96-aa99-eb77a755afa8/32787705594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ff6892-1ee4-462f-995e-d7ec3c122774/fotojitexesin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cfa93e-41f7-4aa7-8671-cdb3e69bf067/dikkat_vcudunuz_konuuyor.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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 5300 bytes
SHA-256: d8eaeb2c6fd425b7d83b0d31b83df525a5b1b97e1bd7f95c46206e9125643e99
font_01_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 10256 bytes
SHA-256: 40ad7818403bf20d820350ada73bfcce3b13b07249ebc252c7066b3c6b983669