Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9fb5f0553b4306…

MALICIOUS

PDF

73.0 KB Created: 2020-11-17 20:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4172ef1f482e6873dcb3074a879b8ce5 SHA-1: 5916ac0dad152fd7c27a1fcba434737913ef1289 SHA-256: 3c9fb5f0553b4306046773a92511d7417346e51b11b8d23603b52e748b396fca
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 one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=chip+on+the+shoulder+tattoo
    • https://cdn-cms.f-static.net/uploads/4474987/normal_5fa8d9d4c7c58.pdf
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f94f37e74906.pdf
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/rusak.pdf
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5f9331c742717.pdf
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5f965d9b365a4.pdf
    • https://towajusuw.weebly.com/uploads/1/3/4/5/134521237/9cfc1cb.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/xumilokor-bivusot-vedewe-tokej.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/80bd6.pdf
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fa2fb9a4a419.pdf
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/togotukidobiziw.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5fb3ff3c5b732.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f9632926f382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8e9b01a7-f555-40b7-a3ea-906825faa932/xogojuribugoluremut.pdf
    • https://uploads.strikinglycdn.com/files/3e2eedb3-af07-4563-8ec8-2d598e72e221/criterios_de_la_conducta_humana.pdf
    • https://uploads.strikinglycdn.com/files/77c1383a-62cf-4a2f-bd29-98736e7b6b51/driver_education_final_exam_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/77e07fb6-9d78-46e1-b102-d14dfd404a3d/94979128333.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d053.bin
46bf8c153e061a162237c07fbce33f40197fee466b64ca5d5b83232182a4c42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 4952 bytes
font_01_sfnt_off0000e115.bin
111798ac0a8f7183e82caec15a12f3f010b060858fee35cef77e39fe51dd488a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 11644 bytes
font_02_sfnt_off000108fc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 4324 bytes

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