Malicious PDF — malware analysis report

Static analysis result for SHA-256 66da27752cacbc46…

MALICIOUS

PDF

78.3 KB Created: 2021-05-22 00:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c58836d894a6cf08c9c2d9b736c80320 SHA-1: 533c1fdd1171132ef8a0f72569c3e1470bb47fb1 SHA-256: 66da27752cacbc46c3d67f33663deb3217fb9a479d4d785ae7837e763f9f058a
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=how+to+find+the+displacement+of+a+particle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fe94feae2a90.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/e36db9.pdfIn PDF document text
    • https://pidesetax.weebly.com/uploads/1/3/0/7/130739971/belidenejexupazuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5ffaaf8fb20d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5fdd1ed707e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5fdbc5c3d9a59.pdfIn PDF document text
    • https://sanositew.weebly.com/uploads/1/3/1/8/131872303/1c8873ab344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_601e2d47ba392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_6033a05cc7fa2.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/8193852.pdfIn PDF document text
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/6589533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_6023c395d8a51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5ffea28d46e08.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/626da722-7c6a-4447-beb8-0a874b75480f/jilotegubuzegat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20cbcaa-7f3a-4d3d-a915-cdaf7ce69c4b/pofawatazodadekon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5575cd-ba4d-4c43-87c5-51772892fc26/88396898574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9f1e93-ddb9-4a9a-9c04-34da11fc1cc4/how_to_use_fermented_fruit_juice_for_plants.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 6632 bytes
SHA-256: 4bd464f7054956e8bda7b3ffd77d786ae252fa4ba23a5053d0eb145af3c20cd6
font_01_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5448 bytes
SHA-256: ed23689f933de6b5439385ceadf72da83efcaba08e0bf91f84bab1d4acab97e4
font_02_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11628 bytes
SHA-256: 2a56d840e90f952175a4d98af3b5f91f82608ab06e42047c0463c8b786187974

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