Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b51e9c1dd46d4e5…

MALICIOUS

PDF

69.5 KB Created: 2020-12-23 11:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b7cea1fb30b57d101c3f652435e5a8b9 SHA-1: 97b9b226e28cfba2f5bc246ab99c41ebef936949 SHA-256: 9b51e9c1dd46d4e561ec84c92df02048d1a39d1bd7a825e938be0771b99f8d44
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary suspicious URL is 'https://trafftec.ru/strik?utm_term=exonerated+definition+in+a+sentence', which is likely part of a phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to a malicious site.

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=exonerated+definition+in+a+sentence PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5fbe362181289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f8d6ddc7a4bf.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/5e6728fe3.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/cefaad17-e66a-466f-b5a4-a5fad3b41487/animal_testing_persuasive_speech_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ad25b0-20cb-42d2-8fbb-a642962ba023/79330598819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9925b0f0-cdf0-4e2d-8e68-6f9d203966e9/precalculus_functions_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9a7d4a-4dbf-4c41-893d-d2b9f0d87164/pulotetixolavebagumabegot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/279c9b36-12dc-4d4e-be70-ac56a3100ed5/mubiwug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c6ec2bbd74065827f47b/t/5fd682ca7fc52c20692977a3/1607893706849/calendario_mundial_rusia_2018_argentina.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdf3e78d6066e35386818d1/t/5fdf478bc18bd5077cb10c68/1608468367328/41749017180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b10731-8360-4e70-9d26-a370a6de9d7f/39048572244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7abcb03-870c-4180-9548-e8c16b5bd755/a_car_is_driven_225_km_west.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc537998787e879898820f8/t/5fcf60a6505b451de18bff41/1607426215216/teaching_kindergarten_distance_learning.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe28dc22b8ce2532b5a5215/t/5fe29e39f60ab725923ea54a/1608687162090/new_bhojpuri_movie_2019_mp4_hd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc1020a4f98375720037e41/1606484490986/algebra_2_permutations_and_combinations_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 5008 bytes
SHA-256: f5348009734cbcb205d4d15c8b7dda63c3a12c56f5afe5363914522efa31a1ba
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 12108 bytes
SHA-256: 290ffa4c673accf71b5f02b2561e3f73a2ce466ad4fb9b78cd278253478b02db

Open this report in the interactive analyzer, or submit your own file for analysis.