Malicious PDF — malware analysis report

Static analysis result for SHA-256 636405b2fb81949b…

MALICIOUS

PDF

78.0 KB Created: 2021-05-24 23:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a1c7d4fe9886b3fc382eeb8a5ee55415 SHA-1: 47777321f9e7345576076ddddc35003aa6b53d32 SHA-256: 636405b2fb81949b911c8fbb1270ac8aafb0e1d6894f665bf609b48ef702b850
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=geometry+dash+2.5+descargar+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_605d5a1fc4c7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcca3e0caf37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_601e74e2b1fe4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372087/normal_6008638d5887c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5fd3d2ae62a80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453540/normal_5fed305e0d7b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_6003bb9d9a3bb.pdfIn PDF document text
    • https://gefidiwe.weebly.com/uploads/1/3/0/7/130738847/gegaxuxuluzo_getifetevuwawaw_vuwuf_gevadamam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_60388a3487c39.pdfIn PDF document text
    • https://pupikitonusu.weebly.com/uploads/1/3/5/3/135301263/vagevake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_605fbfd9d914b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_603f108a64b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6021672623ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_6010cef8ab75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_605ac2ada98f4.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/521347d7-e72b-4dfc-9904-7187c2c7b66c/71615817784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7070953d-0da8-4b7b-8943-065b3eedb4d2/97533497970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bfa389-d6e1-4d30-bffa-18a210611c9b/schwinn_sidewinder_electric_bike_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500a63fd-795f-4460-9f1f-e80e48b53fda/new_monster_ducati_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cda94bf-e80f-4fa3-b5af-e4ad5d464c2a/pogazunivepivifiduduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab74cb87-025f-4ba0-a6c3-0d3d564f697b/xavovibozoweri.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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5876 bytes
SHA-256: d6d8e1ecfb8e2ad00a93125bf52cb28b2569a60b78ca99d14f202e28c2982b08
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 12252 bytes
SHA-256: 9d186f6f3928767df89e5e370ad54fd0360f69997bc441a02ccae7c0da37d4b4

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