Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d3aa24d762cce4…

MALICIOUS

PDF

66.6 KB Created: 2020-11-18 10:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0cc4ac64494fe8ddd2939d9a023213d3 SHA-1: edd56e2a5da083b691500602b1ff1e798e1ee2f8 SHA-256: 20d3aa24d762cce43de386c95fe28f8a4c57a9e4ebcb8a408c8165d3b8af34fd
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The heuristic firings indicate the PDF is a malicious redirector and part of a link farm, with ClamAV also detecting it as a phishing trojan. The embedded URLs are likely used to download and execute further malicious payloads.

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/aws?utm_term=science+8+changes+of+state+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f8d37ba856b8.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/fukujune_nefokosa.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/997cbf5025e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f8e9c0aead10.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/kogedugutisizo.pdfIn PDF document text
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/c3f0d23085e6c6d.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/kunoj-lututudupab-xozuvo-lowobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5fa8e61cca485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5fab87ce0d478.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/fovusedurutagod_sekanener.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/2c99a20d-1947-4dca-a6e5-218b4321425c/lugef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632704f1-3dcb-4157-8793-804611cf503d/rim_world_toxic_fallout.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_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 5564 bytes
SHA-256: 0a31f3c4c562089baa1404c96d400cac68bebafa147fe8c9ca5af62e6d89c1ae
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 9928 bytes
SHA-256: 6cab49f752f47bc9d5ca92d15013a37d9934e9ff4b488e260fbb240e053bae82

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