Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bf2ab9e7a7eac4…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 09:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5483ee0c3cad6d943d688785b66c40cc SHA-1: d530c56dc574af0029ad9c9f754b0d9fe11b9262 SHA-256: c0bf2ab9e7a7eac43053c29e3251e3de2ec67846f1206be2958d22c885a45aff
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics flagging it as a malicious redirector and link farm hosted on disposable infrastructure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the primary attack pattern involves directing users to potentially harmful external sites.

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://yafferge.ru/strik?utm_term=correct+skin+tone+rgb+values In PDF document text
    • http://fortuneocredit.com/central_and_peripheral_cyanosishr9gx.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/asynchronous_and_synchronous_transmission_in_data_communication.pdfIn PDF document text
    • http://khanapoorti.com/vizilivaxamav4awo.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/OIs8Fic/67608057871.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • http://nutigunejome.22web.org/regex_cheat_sheet_python.pdfIn PDF document text
    • http://bazegal.iblogger.org/bheema_mp4_hd_video_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/nichjhe/nabosom.pdfIn PDF document text
    • http://josebixotarez.22web.org/why_learning_theory_is_important.pdfIn PDF document text
    • http://grafoanaliz.ru/delay_dont_deny_facebook31lcz.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/23346887822.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/add_text_to_in_preview.pdfIn PDF document text
    • http://tutulobos.22web.org/gujalewepepozazosad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://vesedakowata.onlinewebshop.net/gufamesufoxuwit.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/73025573829.pdfIn PDF document text
    • http://vewomani.rf.gd/96268131559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52de666b-9556-45c2-a857-36da5c2fe3bd/72874057041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a16b9bc-3748-4915-a3bc-05a14a5203e4/givinoxuvobave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e29114b-a414-49c8-9e81-a60bf6ec2dbc/how_to_turn_on_ryobi_trimmer_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a082128-03e0-4068-b7ce-669757e65e6b/52804608080.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5136 bytes
SHA-256: 49535adaf6ac3134362153ed8f5bfd5130bbf0867294ed5be6c8b2d244dcbe38
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 6068 bytes
SHA-256: cb159cc9d714520fdf604515834a8e5d6ccdf81551317d8133b939af7313f940
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 10436 bytes
SHA-256: 77eec668a7d49ad5baeb486c4ba9778795c14845605913c01d56e0fffbe4fa52

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