Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44cb3f2fad41747…

MALICIOUS

PDF

70.1 KB Created: 2020-11-29 13:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 884ae83d85f9b85bccf5de580d662f0c SHA-1: ba6556c1e701e84292c3b4c486748eb1e91be5b9 SHA-256: d44cb3f2fad41747663ccc73a6fffa1f163550262b053f14b3cbcb2322f33242
222 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a phishing or malware distribution site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a spam or phishing campaign. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=bpsc+65th+answer+key+dhyeya+ias In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_5f92c3eb43555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f9800e7511a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5fb2957b5659e.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/parififuwezape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fc1570da15ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f8d02570a404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_5f99f3728cdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fac4f5ba5fb5.pdfIn PDF document text
    • https://nagewapebikex.weebly.com/uploads/1/3/4/6/134647925/56cd912e7175d.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/kojebumap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/patotale/toferakalexowodefuve.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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 5716 bytes
SHA-256: d21d6f064db753c2ec86639f9be98c5f4fb8ce46578858be0312a970f58db1bf
font_01_sfnt_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 10528 bytes
SHA-256: f4065bc4cfe1ea752dd93bf7a13dff3885c6254f26df1c461d18511efe845366
font_02_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 5508 bytes
SHA-256: aaa2467a44df497c2604abd571a7ab3f7ea2d12dede073b8c53996988ca4c3c3

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