Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0581bcf5e1431c…

MALICIOUS

PDF

112.6 KB Created: 2020-11-13 15:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d3d305569ce247079ed91a51af743d71 SHA-1: 2de374ed6248c226a9d66aad453fccabe76be44e SHA-256: 7b0581bcf5e1431c1b68f3b3c1531e6a6df42a6f9af98dcbc7995edcb86e6d73
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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?utm_term=green%2527s+theorem+and+stokes+theorem+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5f958047ec0fd.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/sunepuweril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5fad91ac80cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f993f6cca2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5f94af21cd105.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/tevetilodoseli.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://uploads.strikinglycdn.com/files/4fca8afa-25e9-441d-8629-c55fb6487f7a/dutexozitetajugemeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd5dfb3-b704-4cee-beda-591fd79d559c/nibiwepanijewez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98019dc0-5418-433a-a120-3bc94846ec5a/zidisupavajefulida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7436214-38ef-4829-b7c3-38080bb18062/infinite_improbability_drive_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d69823-5bdc-45ec-aec8-bc9626f29548/the_untethered_soul_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e658f4a0-65c9-4e58-8d76-93f1fa4e2249/25044776464.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 21964 bytes
SHA-256: abded1ac9873012629f29565aa62898340269a63e6c57303ed20bb3279f461d0
font_01_sfnt_off00014e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E61 5116 bytes
SHA-256: 58a9e7822e29aa9486db0859f8246d478bc07ec0fb59dc0dbcab8e50c5ea2e87
font_02_sfnt_off00015f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F96 13980 bytes
SHA-256: f645f93a7d78d022a2ae1b1dc1df763efad68996ba98b61dfe6bf709459e11f9
font_03_sfnt_off00018e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E4C 16880 bytes
SHA-256: d66c00983018e35c3cac7dc2701e5715b13e88893d2eff204d3445df09afa246
font_04_sfnt_off0001a692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A692 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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