Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d0c67d60a44f7f…

MALICIOUS

PDF

79.2 KB Created: 2021-02-22 20:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a79d189a23dc8107d21e8fb53212de1d SHA-1: 84563f8dcf4f8c1ece4545385dcdd5bb5a3489cc SHA-256: 85d0c67d60a44f7fbb6f85d0e9399f43dea823ec4329c63010b1bec4b50f4472
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs point to disposable domains, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=sony+rx10+vs+rx100+vi In PDF document text
    • http://copyrightnotices-form.com/easy_birthday_cake_recipes_for_dogs6gcwh.pdfIn PDF document text
    • http://ulekschool.online/google_image_search_on_android_tablet04c0c.pdfIn PDF document text
    • http://4gusevshop.website/astrologia_vedica_gratisqvv1y.pdfIn PDF document text
    • http://eurofamily.pro/which_is_better_it_or_computer_sciencewy47i.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/kudut.pdfIn PDF document text
    • http://secureappeal.com/conjugate_acid_base_pair_worksheet_19-_2wvraj.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/jumup_gerewakow_rekepowukurik.pdfIn PDF document text
    • http://prizinsta365.website/dusosewemefavekalaktxcb.pdfIn PDF document text
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/vopab-dosivejob.pdfIn PDF document text
    • http://nickned.me/color_splash_effect_pro_mod_apkbfijl.pdfIn PDF document text
    • http://vifaborabab.22web.org/rudurumak.pdfIn PDF document text
    • http://hookup750.website/how_to_use_plt.legend_in_pythoncgahe.pdfIn PDF document text
    • https://gurugurib.weebly.com/uploads/1/3/1/3/131384113/xopisumiwi-xuzor-jorof.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/871fcf9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepirizifomonij.epizy.com/arturo_perez_reverte_sidi.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/mommy_to_be_corsage_template.pdfIn PDF document text
    • http://wekaniloba.rf.gd/25349820351.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/coast_guard_blue_jacket_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/campton_semibold_font.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_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 4964 bytes
SHA-256: 27f8f1da56fd475dd8a39b420c92153a88fef4ad8a4966f06b687eb43217539d
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10876 bytes
SHA-256: b4c294f20537c132f66b7616761b136cbba6aef9f76396b37e5040dc81cf457a

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