Malicious PDF — malware analysis report

Static analysis result for SHA-256 26047316da9cbcc8…

MALICIOUS

PDF

68.7 KB Created: 2020-11-25 21:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f98bee183011886d3b231b853ccd7ca6 SHA-1: d3c47ff31b17dc63431c6d41d4c424859231b2ab SHA-256: 26047316da9cbcc8ea54fadfbbb5831ba5c464d13399674c7c77b587eb6ecfad
244 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by a machine learning classifier as malicious. It contains a large number of embedded links, many hosted on disposable domains like weebly.com, forming a link farm. One of these links, https://gettraff.ru/strik, is known to redirect to malicious infrastructure. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous links and the malicious redirector strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?utm_term=movies+at+rancho+san+diego+theater In PDF document text
    • https://lujalidulosegex.weebly.com/uploads/1/3/4/3/134369289/botaxaf.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/bubasorasap.pdfIn PDF document text
    • https://fukubumo.weebly.com/uploads/1/3/4/0/134016705/vadidexelonixitoxupi.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://rugotegejobaxus.weebly.com/uploads/1/3/4/7/134734811/belodawu-jimewoluwa.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/8830763.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/kuruxobewi.pdfIn PDF document text
    • https://tisirobe.weebly.com/uploads/1/3/4/6/134699904/vazifub.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/37d346d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5fac36a54c2b1.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/0eed5fc7-cfd4-4396-aaf2-6c234a406a4e/luzevirazunuvotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74015da-f8c4-4db5-b979-36b9e08ad74e/33425159033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84197b12-61f1-44d6-8b34-f77a405d110f/jiwaroripasupozik.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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 5236 bytes
SHA-256: 284c41c72030e369f2ba2fdff5165888dcc15ac34cf72fc7c036cd3d49f6b548
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10784 bytes
SHA-256: 52b46c5a4d621d96f76d4c9b479f43fab7952b5af8fcf427fe52f44164978b07

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