Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c8ba3d5ea5a924…

MALICIOUS

PDF

75.1 KB Created: 2021-01-02 13:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f46bbf25c7cd15b10a18c70806aafa09 SHA-1: e05b2db5326544978350bee0bcb9c2fed73dbd4b SHA-256: 82c8ba3d5ea5a924193a90806c18e426ff6a4ba6574c324a39248a6c3f3ac5c3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, and another identifies it as a PDF link farm. The embedded URLs and the nature of the heuristics suggest a phishing or scam attempt designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=3d+model+sketchup+2013+free In PDF document text
    • https://magozenidudib.weebly.com/uploads/1/3/4/7/134711122/5566395.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/vanuzekumo-mapupunu-wofefej.pdfIn PDF document text
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/6959121.pdfIn PDF document text
    • https://soxajerufoxizas.weebly.com/uploads/1/3/4/8/134880654/5068757.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/4729811.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/0fe3d475-a806-45da-bd34-eb8c8331c0db/62526398459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae5c7c5-de63-4861-b46b-4377aa27e049/yellowstone_cast_teeter_jennifer_landon.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/81070356699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f6775d-5ad8-4947-92ef-9c29321d30a4/rozor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34fa605-f15a-4e9e-abc4-a5509186cd1d/keto_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c46f646-eda7-4438-81eb-3898f3ef181f/zarufadipigozopikozowu.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/machu_picchu_purpose.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/dufifimufeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa83596-0a7e-4236-9828-ab33ca468373/topical_memory_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037d7283-5598-44ef-a2af-b3c1b9b40cc7/honda_marine_service_manuals_download.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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 5684 bytes
SHA-256: 183ecf902187dd46b8ae61cd4d6049d12610c4b7d2726ff7be95b12fcfb5f6fd
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5644 bytes
SHA-256: 02ffb282e934162ee86d9ec90db3c658fc8ba334d413792e467c027c81553dbe
font_02_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 12612 bytes
SHA-256: 7659e77bba0bba4718dff997c4ce8464e2b14ad8ff2896ff05ef164e0ce8b666

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