Malicious PDF — malware analysis report

Static analysis result for SHA-256 684f41c27342b807…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 03:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 918a21272f3a2bb4c5ba1b42664c0481 SHA-1: 383c1a3c9c8be25580452b9e898453ab682d59af SHA-256: 684f41c27342b80747591a5612fc25a8f0a14b8e03a5f23e93e8ed2e25f2b0d4
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 numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to study guides, indicating a social engineering lure.

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://druttle.ru/wix?keyword=the+giver+short+answer+study+guide+questions PDF link annotation
    • http://gukapeb.iblogger.org/folilenuwuzukevotiva.pdfIn PDF document text
    • http://rasazevedip.22web.org/how_to_bleed_a_daytona_floor_jack.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/naxowanemajada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6003be7d45294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5ff3e7e41b3a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_5fe332d97b874.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/wadulibekuzaluw_tobel_muruxin_pesemu.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/digital_logic_design_textbook.pdfIn PDF document text
    • https://jojapunopumaj.weebly.com/uploads/1/3/1/4/131482926/reponatudumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodegifu.atwebpages.com/descargar_album_completo_de_ana_gabriel_gratis.pdfIn PDF document text
    • http://wetetepipemo.rf.gd/edexcel_gcse_maths_examiners_report_2017.pdfIn PDF document text
    • http://rifezovepon.rf.gd/basic_english_study_guide.pdfIn PDF document text
    • http://bolapapuziku.epizy.com/chipotle_chicken_bowl_nutrition_information.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/english_programs_near_me.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/96202312470.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/miller_bobcat_225_parts_manual.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/zunipike.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5384 bytes
SHA-256: de527c4de0adb5968ee0c20388f270b6bb6fe94dce2b66e8a6ac4a50bf995839
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 10920 bytes
SHA-256: bf1ae314c4f7805fa586317beb6db3354537b77637e03809e1ec00c7ea73ad30

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