Malicious PDF — malware analysis report

Static analysis result for SHA-256 d940a761661d64a4…

MALICIOUS

PDF

86.1 KB Created: 2021-04-24 18:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 600c1562c2c4ce85f8ce00645012d6f8 SHA-1: 6a2a2f0b64cc45f637a39a170646411b0e59e8bf SHA-256: d940a761661d64a4e2f44631a11905ccbf656c46202f9e29d6bdf2de221cab4b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, with a primary lure related to 'Plantronics m180 pairing mode plt'. The PDF contains a large number of external links, many hosted on disposable domains, suggesting an attempt to generate traffic or distribute further malicious content. No scripts were extracted, but the overall structure and link farm nature point towards a phishing or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=plantronics+m180+pairing+mode+plt PDF link annotation
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/xekasigirifi-jukexuviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_601998c203720.pdfIn PDF document text
    • https://wobakasufafe.weebly.com/uploads/1/3/2/6/132682589/75f0340622359.pdfIn PDF document text
    • https://zisifogadudup.weebly.com/uploads/1/3/4/7/134765868/napolu-vogobil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_6029cd5e96493.pdfIn PDF document text
    • http://degimoto.22web.org/zama_carburetor.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/1365812.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/doliw.pdfIn PDF document text
    • http://banujal.iblogger.org/chhaila_bihari_bol_bam_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_4f2d207322a342a097717601cc62eb88.pdf?index=trueIn PDF document text
    • http://tesuzegijibonu.epizy.com/favutazite.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_0752b3bea1c14c5cb8c5fb0436907cb0.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1f3c5f7a577049fa89d21ce0e2a18e71.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_267002dfb6a04929af3e2a9ed57794d2.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_d4a93397159f4dab9e24976057b6c04a.pdf?index=trueIn PDF document text
    • http://misezofet.epizy.com/how_to_start_whirlpool_quiet_partner_iii.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_dee548bbbd9146368c0808ebf82074d4.pdf?index=trueIn PDF document text
    • http://gidepajujida.rf.gd/shareit_app_by_play_store.pdfIn PDF document text
    • http://tixuveji.epizy.com/a_ha_mtv_unplugged_summer_solstice.pdfIn PDF document text
    • http://sujuxokilir.epizy.com/customer_details_template_word.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_c0d2f2b6dc204ae0b4274a7bb0caecd5.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_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 5784 bytes
SHA-256: d647755920624bbb2ed232f65024e8afa46de8561ce32d5a1e21eea2f4751953
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 11076 bytes
SHA-256: a6894d68d9ed651741b6721c32cd893843c6414decce72bd7b12ad9c12ed52bb