Malicious PDF — malware analysis report

Static analysis result for SHA-256 1990e21f5f8ae14d…

MALICIOUS

PDF

108.3 KB Created: 2021-03-31 21:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6bfd87b364c5b49251f3be6e34038912 SHA-1: d5f8a6bf0df31e851422dccc3d099eb44d257ec6 SHA-256: 1990e21f5f8ae14dbc2992432b6a81ff31524e4a00f658e9a7f50d7d096063fd
164 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. It uses an invoice-themed lure. 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 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/123?utm_term=disney+cruise+alaska+trip+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453885/normal_6040e0763a3a7.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/rerajabupodetok_begil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_60261f4b3120b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_605d44e001a91.pdfIn PDF document text
    • https://rafanubenab.weebly.com/uploads/1/3/4/7/134747024/vofaxununite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_0b1f5e104eae43929a83cea530f035fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7982fd-b90e-47f6-98c7-bda710aa490a/precious_remedies_against_satans_devices_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25125b96-e6eb-4f05-848c-90cc0eba39a3/english_grammar_book_in_hindi_app.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_288b4cb5e68742c9bd52a40b9e218203.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f10cff9-3874-4bf4-a0c9-b9130d1af0f1/how_much_are_tamales_at_el_pollo_loco.pdfIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_9bf85fe0f85d4f69a100ac973fd4fdb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc450e58-b6e8-4b37-84d7-083a7b70aa14/return_ascii_value_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c2246b-25f4-408d-87ae-375ca7b2fedd/jeledivavitunodurawuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67960c93-8a77-482a-8ffc-e2ecd62ab70c/polaris_magnum_425_6x6_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b7198d-5954-499b-9696-4e12867a7d47/wumaxugapaniziwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3923b762-13fe-4167-a312-439be0832bf5/wisovejekixodezevosexulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15d06ac-f92f-4139-bf5c-c54b56d206bb/88690786831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790d194f-0ee5-46a7-89cf-491fa15db1e5/89671478303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaea8527-6315-43ad-8ece-d772befbdf84/razor_e300_weight_capacity.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A1 5092 bytes
SHA-256: 39067ace12da3af9695217e65b6a18f48837694a006d9d6aa8e6dc869f35f156
font_01_sfnt_off00017b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B13 11852 bytes
SHA-256: 0f24cebf09cc2b23c585e8b49dd118b8ada3fced850760f838961a148df518fe

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