Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aeb6ac5ef77c698…

MALICIOUS

PDF

60.3 KB Created: 2020-12-05 07:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b24c439a993989a325d6650a43b472c9 SHA-1: dff0b109d1bcbaeb24eed6a343a397244c0ae0f4 SHA-256: 6aeb6ac5ef77c698cf1cda95c63a004e61f3a116ae0b4baf4784b2eadaea9b40
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=uneven+heating+of+earth%2527s+surface+cause+convection+currents
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/zarakelejivifotojeg.pdf
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/tilabotazigutebade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc2a1fc2cf09257bd77158e/t/5fc69afafa04221c71080cb0/1606851323781/40512623123.pdf
    • https://uploads.strikinglycdn.com/files/21993bc2-f276-4801-a4f0-45c29c53871d/inter_tel_ecx_1000_manual.pdf
    • https://s3.amazonaws.com/kiwopusafize/biwupogulugotevogoz.pdf
    • https://s3.amazonaws.com/kavitokolezub/circle_geometry_theorems.pdf
    • https://uploads.strikinglycdn.com/files/47c01b56-95fc-40cb-a177-fff89632cbd9/kuwogod.pdf
    • https://uploads.strikinglycdn.com/files/96e086f0-2a1a-47a9-ad95-a54b5bea6b69/funodisazoxobafavowas.pdf
    • https://uploads.strikinglycdn.com/files/64908056-8747-47c3-93c1-8ab1b83395f3/the_worlds_end_streaming_australia.pdf
    • https://uploads.strikinglycdn.com/files/80f1e47b-947e-4040-8dd1-4a75d02a601d/86131126597.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf493af3de5e49b55a4fc9/1606371643099/golden_lab_puppies_mn.pdf
    • https://uploads.strikinglycdn.com/files/ef225855-6122-422d-9866-35ed01f0709f/napudofajujul.pdf
    • https://uploads.strikinglycdn.com/files/47b11fed-4ced-42f8-b3d5-959d3268c822/25277522445.pdf
    • https://uploads.strikinglycdn.com/files/eb4e180d-56b1-4583-8454-ff7fe0c754fb/83120264453.pdf
    • https://static1.squarespace.com/static/5fc0e46f24b06a7eb3ff1788/t/5fc1c96d08845d0924cc6b1b/1606535536114/7246082776.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b194.bin
f9c2612355c4007ae11f03b2c30b42c0d4bbdeaf5634abb3758b82c8688ed64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 5196 bytes
font_01_sfnt_off0000c357.bin
e2697e0d5d8687734b8f412391ae8900b14ab9ef3652b1bfa67086ddc2b2a4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 9512 bytes

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