Malicious PDF — malware analysis report

Static analysis result for SHA-256 18db31488bfb5e4d…

MALICIOUS

PDF

68.1 KB Created: 2021-03-06 04:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2ef12316531b2936b3235095697f8e88 SHA-1: 09f905cd2dabdf7b9cd5bf7ad67433f9d56589ab SHA-256: 18db31488bfb5e4d85f23b5d305c37cbcbdadd2c013e92cb5747b95173cc26f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9990

Heuristics 5

  • 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://midufefew.ru/award?keyword=nintendo+error+code+2-arvha-0000 PDF link annotation
    • http://lopabobogegise.iblogger.org/14651438165.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/wejironaligonatutezonud.pdfIn PDF document text
    • http://tekirivira.iblogger.org/free_printable_blank_sheet_music_for_drums.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/88319872950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danesanifulen.rf.gd/cheats_codes_of_gta_vice_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6329edcd-9fa3-481e-a08d-162acc0898bc/40_business_secrets_from_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9693fa-7f3c-4de6-8ef5-8c03328f452f/legemamapizuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64e43af-08c1-4b68-8a18-4008d7bdf2d9/55815970300.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/how_to_write_a_book_report_easy.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_1a7c661b800842c99bc6f5bec0b5f4a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0d16f5-8f5e-4299-8191-54a0feb95a74/how_to_clean_carpet_rug_doctor.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_5e212e7310bb4c998a92808e6762b478.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/715fbb47-2339-4457-ab85-214df989d233/breville_smart_oven_air_sale_price.pdfIn PDF document text
    • http://xejarejunap.rf.gd/cash_book_template_access.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa8f147-eafd-47b6-b210-d6adf251da32/cuisinart_convection_bread_maker_cbk-200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbc10fa-76ab-4f1a-90d2-76ceed2d5927/wazikibalewetejaginum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f064ca7-2f34-418a-a05f-20d275bad55f/how_to_switch_to_hdmi_on_hitachi_tv.pdfIn PDF document text
    • http://wulemut.epizy.com/79541090132.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/93804950812.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/notarized_letter_for_proof_of_residency_template.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 5152 bytes
SHA-256: 96006366a7699d4ffb4e9e8f679aef20b4a20918ff75a7a55fdd1f44b4311a23
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 9860 bytes
SHA-256: 3dbab7dbf76489d92d767b3b2df30f277a5e792a2963aa09c45baa388b3e196a

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