Malicious PDF — malware analysis report

Static analysis result for SHA-256 907de50f1d8d8f8f…

MALICIOUS

PDF

72.2 KB Created: 2020-12-21 20:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a1f42f51edd8908e8529639bd21265de SHA-1: ba1e0eab7e951acf69cd0fad7c9c114fbd41f094 SHA-256: 907de50f1d8d8f8f846cd18f21926e8a40115a989e1961e894b6d6b2b1302294
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 heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are likely used to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/aws?utm_term=bollywood+films+2019+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_5fa9c3cf6eadf.pdfIn PDF document text
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/gekubusage_zodewusijuxe_rawomitu.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/pugezezesujusax_telef.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://s3.amazonaws.com/belapawerezuju/bexoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135dd30a-00fe-4a26-9514-f9f402de23a9/bad_boy_mower_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/69926331380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796bb0ef-9fb3-4269-b669-b8fc1edcfa2d/bakevedofanemewi.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/9760464530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef47b31d-be0e-4f62-bbd6-7c341b6f5835/60975464148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ca4539-9ae5-4fac-bf30-7293ff335afc/dulenod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09541cee-e628-4cba-9bd2-6a0506153d86/pemojexumixasozusodet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51b2d405d5340f344d547/t/5fcf408868c18617d40dec76/1607417996769/tiktok_download_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/dynamics_365_for_outlook_user_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 3108 bytes
SHA-256: 4c1f3f2ef9d1bf65fb25f2b43ce4ee5a81aeebdb0a6643f22503f91a5bda8648
font_01_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 5172 bytes
SHA-256: eef88e0454a3fddce96556a313dfe7c0881f647c20c2cbdf28e06a774f77450d
font_02_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 11332 bytes
SHA-256: 4ad170016039caba2d0b843c4b7c4c34c3cfd5f3e12f2036ae5e408e0b61645d
font_03_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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