Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a3e18437101d52…

MALICIOUS

PDF

73.3 KB Created: 2020-11-11 09:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1d491b3d195d8be3c7143b4c41146ca3 SHA-1: 3ef05fca897a20ed9a07c952ad66cf390b793974 SHA-256: 10a3e18437101d52a2097949fa7979d2e9369572c3c53eada3e8aca3f6b38361
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate a link farm and a malicious redirector, suggesting the document's primary purpose is to drive traffic to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?keyword=yeti+blue+microphone+instruction+manual In PDF document text
    • https://petugureb.weebly.com/uploads/1/3/4/4/134445868/4162421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f8c0db807cc0.pdfIn PDF document text
    • https://robonodibogiva.weebly.com/uploads/1/3/4/6/134630072/liwasiko_tidejilowupesi_jutelefosufokon.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/653939555c5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5f9fd3ec87446.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/11921e1a-887a-4d83-aba5-7e79678ce510/53867297283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6307041f-1b54-4c37-bc16-99f14522f5df/74454088079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3683a437-537f-40ca-8795-7bf5f22f768a/microsoft_access_2016_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/applescript_gui_scripting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e233f34e-7b71-4a75-8477-33f45e91c6b8/18651339129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf53a925-0cdd-4644-b375-0b4e4744fc8f/35073889624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cbe044-f9b5-4102-a84d-47ebe2920ce5/xurofufimi.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/lojumowubowabavozuxagivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbb6dcf-7528-45e2-835f-42985e191e65/56288254579.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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 5272 bytes
SHA-256: 06c10d6b65f4640187c77c27b447cdf0418073970655efe9afdccc219c305f6f
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 11004 bytes
SHA-256: a55c6f82b2b454841ddb236cd2804ff1b849523229a64799989085d80a5b5c45

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