Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa725aba806c4033…

MALICIOUS

PDF

64.7 KB Created: 2020-12-11 07:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: da7b8fe0fb6d1b9db13e91c9c432738a SHA-1: 1d3298a875e35dfc7f519948ddff06794d4de62e SHA-256: fa725aba806c40332fca49f3001ab82e2455edbae8e19aec967f382bd5d8c596
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a link to a known malicious redirector and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'Microsoft action pack maps downloads', likely a lure.

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://cctraff.ru/123?utm_term=microsoft+action+pack+maps+downloads In PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/36d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_5faeec6da8f84.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/af04d84b.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/58b12c1a6.pdfIn PDF document text
    • https://towalexurunodu.weebly.com/uploads/1/3/4/2/134266150/nabaxavibuvivabidezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5f9f90638f7c7.pdfIn PDF document text
    • https://jivarogogujuno.weebly.com/uploads/1/3/4/5/134513891/3750603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5a0ade2fce462bcac1c8d/t/5fce4605eb18547f4bb22e7c/1607353862160/gekiposetanudiparisutu.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/tuxoriwolonojepagusugub.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/dilapidation_report_brisbane.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64bcb8139af037669cba4/t/5fcf12fccaa95a391e66008e/1607406332213/59023155911.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_off0000c192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC192 5460 bytes
SHA-256: 8afa2ab19ecb395cc46b689fc7e127c79619a906075e87011e9a285c81499f14
font_01_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10036 bytes
SHA-256: 850ba98fe9fe2f502650f9e56d40941c0d176f5dfe44fa4d8ce30bd13c0ddb3d

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