Malicious PDF — malware analysis report

Static analysis result for SHA-256 539f03840761e585…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 00:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f6f99c748342045001b3ace5bd84d33 SHA-1: 09fdd430a5d6f0d778fedce44a95ea0e87b12667 SHA-256: 539f03840761e5858df3d93bd455b5ab46b1babb427d6196f4da1fb522d1a0aa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one that masquerades as a search result for biblical information, likely serving as a lure. The presence of many links on disposable hosting suggests an attempt to distribute malware or phish for credentials.

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 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://zajinet.ru/wb?keyword=cuales%20son%20los%20nombres%20de%20los%20hermanos%20de%20jesus%20en%20la%20biblia PDF link annotation
    • http://kakorixow.mygamesonline.org/vox_ac15hw1_for_sale.pdfIn PDF document text
    • http://remawunusubo.22web.org/japazumegujonawupesidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601e8d2d39551.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/belara_21_7_bula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fd32330777c8.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/fubudasofuvagukatepajunam.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/jcjjfKf/white_cake_mix_and_lemon_pudding_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/bJighcZ/80078606092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_602706a878d16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5ff5ea5ae5a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6053802067130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_dcd95867e17a47f4a2c36bdcac8454af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minabiwa/blood_money_all_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/ikea_brimnes_tv_stand_manual.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_8a80c0c6cc2e46c48738ed23bbfc6724.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_d5df2a586869489aaf34fdac114fc66a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudefem/asus_zenfone_5z_android_pie_features.pdfIn PDF document text
    • http://towawemigegi.epizy.com/hurst_cardiology_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/94328498352.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_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5188 bytes
SHA-256: 99b7eefdd70eb08db7760a0238d9160803cb1fb83558a0814ce07caf2a60656b
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 11968 bytes
SHA-256: 3bd0e155e473673d402d902ee25cc431c1bfff4e4324a94515d4690990a61216

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