Malicious PDF — malware analysis report

Static analysis result for SHA-256 8222c11bc72e90d4…

MALICIOUS

PDF

74.8 KB Created: 2021-04-24 14:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ca244bb58da1a0584b63feea89aeffa1 SHA-1: 7e15e5e2b27e8c1e9faf106fd6b2b573c43a02e2 SHA-256: 8222c11bc72e90d417d02b5a2d2cb1496fb1ad694f3df05e2b39569ccec59291
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

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://lozipotod.ru/strik?utm_term=how+to+treat+metabolic+acidosis+at+home PDF link annotation
    • http://usechambre.xyz/is_code_800_steel5z7w1.pdfIn PDF document text
    • http://fofifokese.iblogger.org/abceso_hepatico_amebiano.pdfIn PDF document text
    • http://titopemij.22web.org/acls_y_bls_2020.pdfIn PDF document text
    • http://chambrehq.xyz/9280705079m2m51.pdfIn PDF document text
    • http://vofufime.mypressonline.com/12323484398.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/19080375392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejapem.epizy.com/cebuano_bible.pdfIn PDF document text
    • http://lolukojalima.epizy.com/canara_bank_atm_card_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc42f35-eae9-42fd-b669-0917e5040375/gobawere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4293e8-d922-45eb-b567-291a36c4c7e0/mahatma_gandhi_autobiography_in_telugu_free_download.pdfIn PDF document text
    • http://nipelijikiki.onlinewebshop.net/36253171220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23be6f4b-3eb5-4969-a007-7132b331485f/12332186214.pdfIn PDF document text
    • http://daluzijirajof.rf.gd/etica_y_coaching_ontologico_rafael_echeverria_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a83ef5-5b37-4232-8e05-e005e527122e/28861951429.pdfIn PDF document text
    • http://nexoradi.epizy.com/best_baking_cookbooks_2020_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d59346f-2bfc-4a1e-8b21-99f738132aca/what_is_the_plot_of_stranger_things_season_4.pdfIn PDF document text
    • http://tobesonev.rf.gd/latitude_and_longitude_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/85478833200.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/toduzejivufisosuruxi.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 5372 bytes
SHA-256: bb1316c025f6f330a223b69a38d58fbcf476877c73099f30d4d9a6fd8277cc0a
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10900 bytes
SHA-256: 1caa98d69b922a9ecfda956d274daebcd6a7da7446128dd3cacd27352ccbd14e

Open this report in the interactive analyzer, or submit your own file for analysis.