Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a4fd26923536d6…

MALICIOUS

PDF

79.0 KB Created: 2021-02-15 13:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 43855a8299ebffa6331c7e53eea6b4f3 SHA-1: d9224001f79e59a64812ca85984a916318922b07 SHA-256: 34a4fd26923536d6f07c2ccd32b3584b2d08ea8de8d5f216515df494c0a8525c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many using UTM parameters, suggests a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, indicating an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=air+force+1+pixel+jewel+femme PDF link annotation
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/5526280.pdfIn PDF document text
    • https://wapifonobuj.weebly.com/uploads/1/3/4/7/134744781/2617737.pdfIn PDF document text
    • http://lufoveferezudu.22web.org/mathias_mhere_number_busy.pdfIn PDF document text
    • https://zepekofudi.weebly.com/uploads/1/3/1/4/131407423/kekumigar.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/315db5cc634fac.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/fkicsgj/premier_league_golden_boot_2018-_19_odds.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/ggrgejc/nokiwogofanafejibatut.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/Y3oib6c/butterfinger_ice_cream_recipe_with_chocolate_milk.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/XqOfgjB/26483820055.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/jfnj3ie/98667524344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debarunuzijabe.rf.gd/activinspire_promethean_free.pdfIn PDF document text
    • http://xunevonobi.epizy.com/zitafimufafurebimotamumi.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/tetorawasodexodozuk.pdfIn PDF document text
    • http://xonifovozub.epizy.com/battlestar_galactica_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/puzigatabakazinofen.pdfIn PDF document text
    • http://juludix.epizy.com/premier_league_quiz_2019_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/yakuza_0_ps4_trophy_guide.pdfIn PDF document text
    • http://jesegusanasukan.epizy.com/hunter_fleece_welly_socks_size_guide.pdfIn PDF document text
    • http://posulakepepusu.epizy.com/chef_s_choice_knife_sharpener_manual.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_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 5052 bytes
SHA-256: 62f6142f443ad75d7ef7dcc2a31e16d87b9a8f72e25deef9ed9ecdf4c8981a63
font_01_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 10596 bytes
SHA-256: 181d920f8ea30ea69b7d7c2a159b1efb7b3918823f27e0e30835c553d9846410

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