Malicious PDF — malware analysis report

Static analysis result for SHA-256 a383acbad608f6ce…

MALICIOUS

PDF

74.2 KB Created: 2021-03-12 13:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad242364fb24c6d57da49afef1aa53b7 SHA-1: 234c883536641dd2f2d25410a53de5fe7c2fcf51 SHA-256: a383acbad608f6ce76d11cdcf882525dc51b89c1675f830124d79808b3491fb3
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document's content, though heavily obfuscated, suggests a lure related to expenses or payments, aligning with the 'SE_INVOICE_LURE' heuristic. It contains numerous embedded URLs, many pointing to disposable domains, which are likely used to redirect the user to malicious sites or download further payloads. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xajibur.ru/123?utm_term=expenses+spreadsheet+example PDF link annotation
    • http://xulodol.mygamesonline.org/36208997646.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/hehhjaS/vinewizev.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/hbhd5je/hill_climb_racers.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/what_is_apc_smart_ups_750.pdfIn PDF document text
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/2216858.pdfIn PDF document text
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/lurexetaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_601b44935076e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450249/normal_602090854b284.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/mark_allen_weiss_data_structures_and_algorithm_analysis_in_c_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_6035cda1bcb5a.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/i_got_sunshine_in_my_pocket_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_603d06b9c0c7f.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/sujelowag.pdfIn PDF document text
    • http://zegosuvavanow.22web.org/best_esl_placement_tests.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/the_accidental_superpower_free.pdfIn PDF document text
    • https://josidisufula.weebly.com/uploads/1/3/4/7/134712518/rotigufasune-jewubuvu-ronokojos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_6019f289c6520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijevaru.rf.gd/53307690005.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/bugezir.pdfIn PDF document text
    • http://paxajuleki.rf.gd/el_coronel_no_tiene_quien_le_escriba_pelicula_descargar.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 5224 bytes
SHA-256: 6387a3cbab5bf9dcbd20738c062e61a7632ab266a04c0a55080e44ce5cbe8980
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10408 bytes
SHA-256: 787dc8212bc9b8a02ff2ecb49721d17e50b314885b1810ecd933c52f0c2434e0

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