Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dde4eb7272f221…

MALICIOUS

PDF

77.4 KB Created: 2021-03-04 13:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ba719215e6f376904e59060193fb72d5 SHA-1: e6579d68e8642c0d2567d4a9ef215e8a74bb00b2 SHA-256: 85dde4eb7272f22116f8630386a4c6c8673e8ae4e3670585e7042227820b5b2e
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 document body, though heavily obfuscated, contains text related to 'Nordstrom rack interview questions and answers', suggesting a phishing or social engineering lure. The primary IOC is the external URI pointing to 'seumenha.ru', which is likely used to host malicious content or further phishing attempts.

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://seumenha.ru/wix?keyword=nordstrom+rack+interview+questions+and+answers PDF link annotation
    • http://nezowigivomi.scienceontheweb.net/zapujibikujojux.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/bissell_cleanview_helix_filters.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/susidunozo.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/g-shock_uk_rangeman_gpr-b1000-1er.pdfIn PDF document text
    • http://ramuwazezu.22web.org/92294652616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jagux/soteduzaju.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/field_and_forest_feeding_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38649eb4-ca91-4976-bb42-da616760f2e3/multiple_intelligences_gardner_1983.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/lipawuwowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c155169-8d33-47c8-a856-3aaa271943ab/45053358369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07eb20cd-1bb0-45cb-9020-839155bd2e18/who_could_that_be_at_this_hour_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953b3bab-dbe8-43be-9a99-2a1d22ec499a/how_to_draw_a_turkey_head_and_neck.pdfIn PDF document text
    • http://povusesa.rf.gd/2012_chevy_cruze_manual_transmission_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f357365-ac74-44cc-9200-8018aba573cc/how_to_cook_bacon_in_a_waffle_maker.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/dodat.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/diono_radian_3qx.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/notation_guided_notes.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5364 bytes
SHA-256: 8bb409cf5158007f12215ca6981134ba6a2d4947d03ade1e67e36e1697891c1c
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10040 bytes
SHA-256: 12855acc3aeb79d4d45b1080c5f910d88f17a1bed16ae83457c40ac85f9a3250

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