Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63d8b62a0d87559…

MALICIOUS

PDF

85.4 KB Created: 2021-06-07 23:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 081cbe6825159f4f5a368f14583552b1 SHA-1: c783335388ed4f99e5ad5d2bd63baea1e324c5ad SHA-256: e63d8b62a0d875590d96b5c012c068d3b50caa0c7f9d1a4a42082787fc09c4f8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, and contains a large number of external links, many pointing to disposable hosting. The primary URL, 'https://allytemp.ru/pbw?utm_term=what+are+the+techniques+in+poetry', suggests a phishing or traffic-generation scheme disguised as a document about poetry. No scripts were extracted, but the PDF structure itself facilitates the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/pbw?utm_term=what+are+the+techniques+in+poetry PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fc8faa233e8a.pdfIn PDF document text
    • https://bakijunida.weebly.com/uploads/1/3/2/6/132695635/nijijibokotoboxuf.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/7996235.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/edd11.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/defuvekozo.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/4216625.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/96b8498cf57d7.pdfIn PDF document text
    • https://revogofoti.weebly.com/uploads/1/3/3/9/133999152/volafonizen-desurag-xakalojomodev-nenesowudomilaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fe3b9555ad57.pdfIn PDF document text
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/gulezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff7c6bfbdde1.pdfIn PDF document text
    • https://juvejisedebuz.weebly.com/uploads/1/3/2/7/132740880/bikile_kuroso.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/3089851.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/c43e2ce7-fee3-473e-b626-5b2c44cc5294/how_to_care_for_cory_catfish_fry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2957c05-ac56-4b26-b6e5-b4b5e4f88a00/annabel_lee_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac42ae0e-a465-49b6-9411-3331fdb485fe/19918821312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b35900-b165-4d0b-929b-1384f835df6d/what_size_tires_does_a_2004_ford_explorer_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200d9b83-9844-44ea-bab0-2f2809fa2603/recurring_terminating_decimals_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0dbd1c-c93a-4718-b2cf-6a8e55038dbc/shakeology_chocolate_ingredients_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7fb098-1c08-4c91-bc7a-690a43d22ec7/26165981579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9006764-da4d-4f25-af78-1f076527e236/how_do_i_compare_two_columns_in_google_sheets_to_find_duplicates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e125803c-20cf-42ea-b70a-e944614d75b3/jexefafibakuwabezetub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3280523e-afee-484e-a620-b8e21e2684b2/unit_1_relationships_between_quantities_and_expressions_answer_key.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_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 5232 bytes
SHA-256: c0a3b41465eb78a0214954ff83d902e115d2ddd9af50fbd283e86338ecaa91fc
font_01_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 11160 bytes
SHA-256: 18e81093a60a17fbefa5dc65fdacc2359bbc3ba90ad02de53ebf2f2b1f1f43f2

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