Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4998305f0bc27e…

MALICIOUS

PDF

76.7 KB Created: 2021-06-06 02:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f48a1a7b364c289dee6c37a479debcf7 SHA-1: 97319001381ba51df947d06ff953974cdda39994 SHA-256: 5b4998305f0bc27e7c31a49914d684a9ecaab0d0f0c90623137d34226424319e
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/pbw?utm_term=free+mac+keylogger+detector PDF link annotation
    • https://fukubumo.weebly.com/uploads/1/3/4/0/134016705/bovawa-fibemogufa-rupiga-webusab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_6005f86b386a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_6055031b1c66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_6016360176144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_6022effe7cfe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e8c2a8812.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4497650/normal_60b1e6eaeaa5e.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/rebimerofusate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_605a5a2d70ff8.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/pegumuzelitozi.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/c7023bb8-2efd-4cdd-8d6a-1652fcc647de/what_does_jesus_say_about_eating_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef26937-17db-4580-83c6-befa39107156/6582721386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473d9a50-a35d-4cd2-95ff-aaea73b7b897/how_to_operate_wyze_cam_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b410715-7118-4f7e-9c4a-f6c908979743/25979311226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b27736-2b3c-44b8-a3ea-3241f021cb14/91876423926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10619ba9-9592-4bf1-ad9a-5dc72645641e/qual_o_melhor_carto_de_credito_2020.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144452442/buxevilukefadokonogojar.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144460167/pewejexorezikat.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5200 bytes
SHA-256: 82427d64f2d9bd93c45dacdf735e371d3d547fedb09ece45473e3f79a480837e
font_01_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 12748 bytes
SHA-256: 15bd84bc02118e0690c7f490e873c17f0971196836dace02ae9b8081be685b98

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