Malicious PDF — malware analysis report

Static analysis result for SHA-256 e259e7f35a3efc28…

MALICIOUS

PDF

74.2 KB Created: 2021-04-02 02:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d86d435990fc7bcdf7b500986ba1c864 SHA-1: 3c6d54294b6d768cea44c84ded03bb22e92504f5 SHA-256: e259e7f35a3efc28e78f900e5d6e8b555e14412c1e4a17fd40baea37dace5778
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/award?keyword=tsc+appraisal+form+pdf PDF link annotation
    • https://cdn.sqhk.co/japuwejede/fgeHhfa/nomuxojigepepuwojibelim.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/NjaQhde/vezuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/ifmMxij/6135990570.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gidGghO/sukapijabunadozizilavegig.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/Z6yiehi/gonaxutoboledit.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jiJwjdi/pocket_world_3d_answers_snack_bar.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/cZVuiiP/kujerivenazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f169169-c0be-4dc1-af9b-f041116317fb/14057822924.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_53ad6770b2eb499cbdd1d8a6e341e9ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c73608d-c036-465f-bfe2-216fc8078b46/nomadic_furniture_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/what_is_a_healthy_weight_loss_program.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/examples_of_words_formed_by_back_formation.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_a6c684e12f7e4263a63b8259fc85f29b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a74b861-4831-484a-9094-c4f1a0f8e73a/7339602851.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/jeep_cherokee_maintenance_schedule_canada.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_e747110b59fd4e17bc373c84633feb26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee8d2ae-162d-4fa3-9cc0-33835d9217cb/what_is_the_closest_synonym_for_the_word_chaos.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/56471188882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24345a79-e744-4a36-bf0a-505d2cc32c57/shaded_cream_mini_dachshund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501d366f-46ca-4f9f-bdd3-4cd094b137e1/do_acorde_piano.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_9bb45f7b680341228a0ae9fafd391fdf.pdf?index=trueIn 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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 5248 bytes
SHA-256: 80e8f344d4e0fc52c61ddcdf6dfe1cf3d2281c0f2d7c7eb88a415afde97f952b
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10584 bytes
SHA-256: d9a0492dfc95798769257f54f8656697edb7f4a6aadce30d2c56f5a6550cee5b

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