Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b47c8b05ccb07e…

MALICIOUS

PDF

92.8 KB Created: 2021-03-25 02:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be0aa7f9a6475987e76c48cf3ad9ade4 SHA-1: 0e848cb2f1a8ce1a1c1c4894bcb691fde20c360d SHA-256: 91b47c8b05ccb07e8d392ca492257c8befcf0e170944df7d3bcb0459f066bad2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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.
  • 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://fokemale.ru/strik?utm_term=what+are+some+good+icebreakers PDF link annotation
    • https://cdn.sqhk.co/fekerepusa/jfQ9lic/mabozifigufubas.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/33004244208.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/jadie5N/54481252391.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/hc6n3id/63632754530.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/96451466134.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/english_vocabulary_test_with_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_b2765ab5a64a42e7a6ee498192b86c9f.pdf?index=trueIn PDF document text
    • http://nopugorib.onlinewebshop.net/xutomawiwije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87680ae7-767d-4376-a44e-b602c7ff4f38/my_washing_machine_does_not_have_a_delicate_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/jilokitixipopekezuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e64d50f-d5c6-44d6-8de4-fd569f0b615b/temupise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb253b0c-faa9-4324-8012-958f84f62b93/30216733428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d05f0c4-90f8-4cc2-a910-17d1210613df/how_to_cite_a_personal_conversation_in_apa_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc44c9c-d531-4102-a17e-990462f3b2de/ketogepivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca6e4c1-9d1a-43fa-b191-8fffcb248e0a/vanopesokezosamapomar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ffc06a-1970-4322-80ee-5514e6a5e6a9/befajebux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9416954-01d4-4343-9a94-4aca2e12f391/69361160349.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_1138d0637b4648beb4f3c8f1ac4e3de7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/how_to_clean_vacuum_filters.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/yiruma_river_flows_in_you_piano_chord.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/greek_mythology_names_meaning_beautiful.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/can_you_get_regular_food_at_taco_bell_during_breakfast.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/75644477088.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_ba5ee8cc2ec54d799b0de627e5bb80be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be00bc8-08e6-4cf2-8451-d369604a7166/nordictrack_x9i_dimensions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 5220 bytes
SHA-256: aa175b0a4f53462230782419ba7493bc91ed1d7ec0da0d8aa94e5bdd040a691a
font_01_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 10524 bytes
SHA-256: e4f6b610ebfae7509102a07fc03c52a5a8af0905f7ca5e7588536d860e07472e
font_02_sfnt_off00015745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15745 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f