Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5120c3a91a81d0…

MALICIOUS

PDF

68.1 KB Created: 2020-11-20 13:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 94234794ceeb7d19564d2b2ea39f35e1 SHA-1: dd6f439ccacb38679a37e3e1d94200b21dc1c5cf SHA-256: 3f5120c3a91a81d034bfab1b12cc0ed6438a0ed6444a5cc1cdb8a3e40f919969
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious redirector and part of a link farm, with one URL pointing to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Creditors aging report in tally', aligning with the 'SE_INVOICE_LURE' heuristic. The presence of embedded URLs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=creditors+aging+report+in+tally In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fa65ca85c652.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/3114383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fb37663ba162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5faec89c28f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f92c9dc5e412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5faf38ce4cb35.pdfIn PDF document text
    • https://rubuxunixo.weebly.com/uploads/1/3/4/5/134518382/mifosenezi_wilipen_gitar_xadokibidibej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5f9be02c5e373.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/tonisefoteka/30633952955.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/urban_dictionary_ode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef154246-b9e9-4b61-87ec-d482f515323e/things_that_start_with_e_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/zuwirema.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_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 5040 bytes
SHA-256: e36606ac92f4c5e127be18af0ec1ef2d84309911e89c12cddcdde995e5dc2af4
font_01_sfnt_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 10876 bytes
SHA-256: 549dae2d46fea38f929fc1a660df415d3eb807331938edcd3347ba23a84e2b99
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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