Malicious PDF — malware analysis report

Static analysis result for SHA-256 5296a11f9dde5d10…

MALICIOUS

PDF

102.7 KB Created: 2021-03-24 00:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 48a04a214cba42515e83226b7331f43c SHA-1: c2d1105de2eee77303eb8c9940dd8f7a9b6fb363 SHA-256: 5296a11f9dde5d10c7fa7b4c25dd6db994633d1f16635e45c1bc6b20b3f504c6
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document also includes instructions for a password-protected archive, a common tactic to evade gateway security. While no scripts were explicitly extracted, the presence of numerous external links and the overall detection profile strongly suggest it's designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bologen.ru/123?utm_term=pyxis+medstation+4000+user+guide PDF link annotation
    • http://kinemulawaw.sportsontheweb.net/dofelisulasobuwokibuzonis.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/doguzirowozuvif.pdfIn PDF document text
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/mobabajusaximotuxazu.pdfIn PDF document text
    • https://bumifinanefisan.weebly.com/uploads/1/3/2/8/132814282/4183163.pdfIn PDF document text
    • https://kopadababipa.weebly.com/uploads/1/3/4/5/134502609/b493818287a.pdfIn PDF document text
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/9857135.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/2011752c2091497.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/miwexelukiropogeke.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/6790462.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/38616bb9-f1fd-4b02-8c50-9cfd7215db79/xuruzunajazibeloweg.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_b0f6b5447b4742e4bb3501a1a2a871cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1d452d-8485-4c26-9b76-be77ca2c46d5/how_to_become_a_real_estate_agent_chicago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a8fa60-e1a4-4342-88fb-9f6af19723ae/51259458779.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/guwaxizafuruminofozuvono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b0917e-60c7-4a3f-ad04-4c664f5196d7/81159964097.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/26631151242.pdfIn PDF document text
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_97c06d355d374fcb974902eefda9abe5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13290a9-880a-490d-b1e3-b28affad91bb/xogezudexubutut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a6234e-a2a3-48d6-980c-a3e260e63fdf/58822352303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93173ae-bcf9-4f33-a239-b0450c7a902b/xujelodesomagadasaso.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_off000156c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C5 5516 bytes
SHA-256: ccdee9b8ef2998ec5052aa7cb5502f02ef1fe2a87d9cf25f5c2c11205cf33756
font_01_sfnt_off00016980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16980 10884 bytes
SHA-256: 63f73d7c618d12afc55fc6e78170c2057d6e67fd208a7247ce2c122d2d81ed46

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