Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56555c0e1a1dec1…

MALICIOUS

PDF

69.2 KB Created: 2020-11-23 16:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2a189a265470245c17b90c363f247e44 SHA-1: 5d9611bcf62d08254fc13c03254605c2bd56f525 SHA-256: a56555c0e1a1dec136e67f3188dcfb6d94efcb078812e7865fa8def324d75cab
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=technical+drawing+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5fb8418525cc4.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/57f8d230718.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/dorigujex.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/majevujug-luzokuju-zunupumumuzi-bufuwi.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/malebawujomu.pdfIn PDF document text
    • https://temuruxaxinisuw.weebly.com/uploads/1/3/4/7/134715551/d95e39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/18198d26-fd9a-4fc4-9976-0432ae8a02d6/mimemijozodanijuwaratogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e35e6a-b08f-478e-a39b-0a980cd00d14/72113012460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3ae228-63d6-419a-aebb-9be2fa5eb8d3/vajamakukuzevemev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a157f7-9369-4c69-800d-6614283e4b79/75667051456.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/gelipolaritetop.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/2553070702.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 4880 bytes
SHA-256: 36b7bf37213e4522538a7e321c1e476d52a0d0ee540e5012799daa9f7a0085d5
font_01_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10120 bytes
SHA-256: dafcaf0968e068ee0a9992744262152829760d1803c44b2ec7136312632d7086
font_02_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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