Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8fdda2c920bbfd…

MALICIOUS

PDF

81.0 KB Created: 2021-04-08 10:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153b8086f78758495d30d66d2a4da094 SHA-1: b94fc455eb542df93cb2026c25f04c1018024fb1 SHA-256: ff8fdda2c920bbfd9ca3353656364d5503f767061244a1932d25371d6e862eba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a mass of external links, with one prominent URL pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=ffxiv+aetherial+wheel+recipe
    • https://cdn.sqhk.co/jivonaxadu/ehdhgih/german_imperial_ambitions_ww1.pdf
    • https://cdn.sqhk.co/turaxulefa/icD0GtT/monster_rancher_2_guide_indo.pdf
    • http://dipewafotowagu.22web.org/lakshmi_ashtothram_stotram_lyrics_in_tamil.pdf
    • https://cdn.sqhk.co/nalujujoso/hFm8ier/mojizizixezevitetomebij.pdf
    • https://cdn.sqhk.co/moviferu/jeDtygi/lufirebamevigubokupa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_d468e654b52d47a6a21f01c24b930154.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae7deba7-fae8-4091-8fff-1c9b51e92f81/13657621619.pdf
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_92cb56579aca42b384a2a5e328116aa2.pdf?index=true
    • https://s3.amazonaws.com/palevijuj/best_free_online_english_speaking_classes.pdf
    • https://uploads.strikinglycdn.com/files/5c0a86eb-0d2e-4f6e-8745-3a1a5c7de148/lesco_50_lb_spreader_assembly.pdf
    • https://s3.amazonaws.com/dukexajuj/date_calculator_application.pdf
    • https://s3.amazonaws.com/gekojulog/gafimagokupowisi.pdf
    • http://gozosowizopuk.rf.gd/73342184509.pdf
    • https://uploads.strikinglycdn.com/files/51da058e-8956-4939-a7ef-a14b1bbd2b34/vevidedizavikeximosa.pdf
    • https://s3.amazonaws.com/zikeko/68268525936.pdf
    • https://s3.amazonaws.com/wunupalezozerud/zorotote.pdf
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_10c4e1911fcd46859f247189013d4b9f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/794838af-3f41-4332-8fb5-4b6d658c5006/japajitusetuzawadag.pdf
    • https://s3.amazonaws.com/jemisajoda/chronicle_magazine_january_2019_free.pdf
    • http://kipadopefomuram.rf.gd/geometric_mean_formula_for_grouped_and_ungrouped_data.pdf
    • https://s3.amazonaws.com/kavalukato/twitter_sports_betting_picks.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_f6f8bab4184a4e34b504efb210391919.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51a2bd17-8a6c-4616-82d2-d4530facae64/14524167438.pdf
    • https://s3.amazonaws.com/suzujewa/irregular_verbs_list_worksheet.pdf
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_97efc8066fdd41afbc69336c33becc6f.pdf?index=true
    • https://s3.amazonaws.com/musoxifuvitalo/ruzida.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/bagpipe_sheet_music_for_happy_birthday.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b0.bin
113cd1cb376b00bd97c71156430e59eed52e6ed66bb0960b3798734bbf8e5a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 4672 bytes
font_01_sfnt_off000102c5.bin
2928d8ce412284ff19e76011b6d62645ee43fe90e766a0f6fc1cc6c3f99aa325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10952 bytes
font_02_sfnt_off0001283e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 4324 bytes

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