Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d60dc88e332c2…

MALICIOUS

PDF

82.7 KB Created: 2021-03-28 04:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf3d5f37b4d1b482107e7147c628134 SHA-1: 70866e2bdf17e51e26741a0527b202195404e7cb SHA-256: 225d60dc88e332c2e838b399c577e48ab3f35cc5f113075ceec527b47e0df5c2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The embedded URLs and the document body text, which mentions "design patterns interview questions java pdf", are likely decoys to encourage users to click on malicious links. ClamAV detection and ML classification further support its malicious nature, indicating it is likely a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=design+patterns+interview+questions+java+pdf
    • https://nenonafadigis.weebly.com/uploads/1/3/4/8/134856929/difeg_ravumom_kisaxobazok.pdf
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/xitobobopowode-tugabofelomim-wudujimew.pdf
    • https://kikezisukoka.weebly.com/uploads/1/3/5/4/135400991/degavaxo.pdf
    • https://gomimujetaveve.weebly.com/uploads/1/3/1/4/131406784/womib.pdf
    • http://viwesisikumebi.getenjoyment.net/heart_shaped_box_piano_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_49dd59788c6f41a0b2323f6493fcbe13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/486bb7e5-d9d9-43b1-8573-dd263f7aa62c/mubiganoruvuxomobe.pdf
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_c3342d1f6a3740ed90efb0a158c423a1.pdf?index=true
    • http://jonokib.rf.gd/ancient_egypt_gods_and_goddesses_information.pdf
    • http://zotubune.myartsonline.com/74388876332.pdf
    • https://uploads.strikinglycdn.com/files/fbe115c0-9f21-460a-b6a9-6e90010ea2db/where_can_i_get_a_pattern_for_a_face_mask.pdf
    • https://uploads.strikinglycdn.com/files/dab81b80-fccf-45fc-afc7-5843cefe808d/zawuwulufiwanun.pdf
    • https://uploads.strikinglycdn.com/files/9af47867-555a-457d-a556-7b10243a5c7a/bekezumexo.pdf
    • https://uploads.strikinglycdn.com/files/7f725ca2-83fd-4b4e-8e43-ba7b38b62083/maytag_washer_dryer_manual.pdf
    • https://uploads.strikinglycdn.com/files/fb29402a-da77-4907-af25-55e52c94f78e/zasobu.pdf
    • http://bijezum.epizy.com/adobe_reader_download_pc.pdf
    • https://uploads.strikinglycdn.com/files/0f870033-9234-44c6-a6d8-afdadfb11ffb/what_is_the_definition_of_the_word_thermal_equilibrium.pdf
    • http://widifusi.myartsonline.com/loponunuruzidonupegoluj.pdf
    • https://uploads.strikinglycdn.com/files/b35431ff-e2e9-4d97-80e9-48df05efde54/best_heavy_metal_ballads_80s.pdf
    • http://wasupedojewemo.epizy.com/critical_thinking_skills_assessment.pdf
    • https://uploads.strikinglycdn.com/files/481d3613-781a-4e3b-8a9a-25c67e54ad29/thermaltake_core_v21_motherboard_size.pdf
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_7fc4d20735b249d49d50d140ab34554c.pdf?index=true
    • http://losuguv.epizy.com/nugeriwadonijinipi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f2.bin
9a0a77477c9008a5b68432f92f2e8fdcb58fe824ab512283e43a2613c4075538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 5528 bytes
font_01_sfnt_off000113e8.bin
fd6ef8dda0221829da09b2c3654c206d8df848211cb047274c6748b629433863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 11488 bytes

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