Malicious PDF — malware analysis report

Static analysis result for SHA-256 f213e8ebca3bb758…

MALICIOUS

PDF

71.2 KB Created: 2020-11-11 07:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 873cae00ff4073dbf3383f8ad17b46a1 SHA-1: 1bd097d0486fa8dc64fe56aa5c4ee503cb997fd7 SHA-256: f213e8ebca3bb75816098d923e585dbd3bef77255b28e3e21038d91cd021679d
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a PDF redirector link. The embedded URLs point to known malicious infrastructure and a large number of other PDFs, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?keyword=first+day+jitters+book+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f89a7623c662.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/b42e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f9773c36b06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5faa2488436f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/how_to_go_back_in_piskel.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/deliverance_james_dickey_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/test_pc_speed_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/89861498380.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/73554440059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5de7e70-2741-4c5c-8dbf-fde4041ec5fa/xamonaxemomajoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/8239081957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db15385-c3d3-4e29-9edb-b680b37d9dbc/daburerimafujegopana.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/26822793577.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FB 5340 bytes
SHA-256: 8ef5a167f31d8956b2477d7fa22d08e290ea8a8e8937853104b520e75d7c6975
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 10612 bytes
SHA-256: 92ff1b70f802e40298a6ce25cdc8c792b6a666bacde7409d893df460a9a3c3fc
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16664 bytes
SHA-256: b699db454a40cfdbf9c779d4e6e56d309a4c70950a784420f15d2e376fd220ab

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