Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fbfb898e7a2d47…

MALICIOUS

PDF

65.0 KB Created: 2021-04-01 11:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9345e39fbff1e7829c603544e81d0932 SHA-1: b0aa2c3350b50cec8c3fa44ff24ac037580ef696 SHA-256: 49fbfb898e7a2d4766269b21fa646598b8ac2285f20e25d75828a1332d70625d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=completing+the+square+differentiated+worksheet+tes PDF link annotation
    • http://pejelurim.getenjoyment.net/50585809713.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/mupofudutamapope405mb.pdfIn PDF document text
    • http://nonretloli.site/what_is_organizational_structure_in_managementvn41w.pdfIn PDF document text
    • http://nefritthebestthing.site/jonekobogemabosokodq8ya.pdfIn PDF document text
    • http://ersoil.fun/ivory_color_painttz4or.pdfIn PDF document text
    • http://domainlimax.xyz/lamexutekepakoromatobuvdw1e5.pdfIn PDF document text
    • http://sokolov.fun/merck_chloroform_coag6u3y.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/kudapeferorefapij.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/lidinagiw.pdfIn PDF document text
    • http://love-cosmetics.shop/22274769429y3rqh.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/529cd8c7-0756-4c82-b531-e4d39d2b1d34/fiwigosadepokapigutisuma.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/ielts_writing_topics_with_answers_academic.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_8e60d757c9844aea8ce07a62f7191fe7.pdf?index=trueIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_e2fe0b8d01ca4e6bbca914a2d9794351.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/list_of_former_boston_bruins_players.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/lozopolirusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38cc8f4-347d-431a-a13a-4c1678a0217e/panasonic_uk_head_office_phone_number.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_7e4de4a60f634e36988ca24d2c0450aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/cvs_caremark_prior_auth_form_for_humira.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_76e11ed36ac042cea737a59bdf158ef9.pdf?index=trueIn 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_off0000c22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22C 5644 bytes
SHA-256: a7bc41f78f0aeba5483d2951fa4807c3f4e473709a1636a4ce93bb0bcce25f4a
font_01_sfnt_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 9672 bytes
SHA-256: d0925a80e34c323082560f57551413e8c1b873ffee36f73a44472d30e258b969

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