Malicious PDF — malware analysis report

Static analysis result for SHA-256 b170be4f4b589468…

MALICIOUS

PDF

91.3 KB Created: 2021-03-31 00:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e88266e0fba639fa61698d6a1703273b SHA-1: 1e4e310e34c2caa053235b71c9ff60aac604dc19 SHA-256: b170be4f4b58946822796d8d0c1196743b098f73007d2dae6de0c7b2018adc06
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jacksth.ru/strik?utm_term=hobart+handler+140+wire-feed+mig+welder+reviews PDF link annotation
    • https://cdn.sqhk.co/dejijadu/hjfjwBD/lajoxejidugenafofodeb.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/45939772919.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/cash_flow_statement_chapter.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/27644824908.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/calculus_purcell_9th_edition_indonesia.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinatefoso/teKievk/aircrack-_ng_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/er0jhgj/54327476676.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/sharp_portable_air_conditioner_cvp10pc_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/fI4JjdD/71044063573.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/pathway_fistula_perianal.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/0I3A5Gq/plants_vs_zombies_2_pc_download_free.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/9471662493.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/schizoaffective_disorder_bipolar_type.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulebosux.myartsonline.com/conversion_chart_celsius_to_fahrenheit.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/19607919797.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/bcd_to_7_segment_decoder_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/kedotulajudibarurizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/romeo_and_juliet_act_3_questions_and_answers_quizlet.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_ecba5f2df6d947389c5d265821017f46.pdf?index=trueIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/bonafide_certificate_for_nsp_scholarship.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_bb73890b5ea248e09a7d4065d40ff1b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/speed_queen_washer_coin_box_key.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_c1f972ba615448638833d1d0240c192b.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_a8ff1ee73ad740f3a5e1f1e8d0cbc94f.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_8b86d14170e34623bf2339e5a92441ed.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 5888 bytes
SHA-256: 681039ec1cefbbd68abfd2d694d4ec2b2c684671a1303c5f9969d0d27d0f098b
font_01_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 1648 bytes
SHA-256: 2caeb454a93b18584067451a2b12acb77e4a50455da74f41c574601843ce0219
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 11428 bytes
SHA-256: b8d492716c83914a0817780bd631f85a8834262e0dcb8637e27342e5105b773f
font_03_sfnt_off00014769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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