Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307fda716c813bb…

MALICIOUS

PDF

81.4 KB Created: 2021-04-04 02:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4ce679ecc1673c997691ec69a9b62247 SHA-1: 596f8814ef9280da988b4de003aade466c918580 SHA-256: f307fda716c813bbc2c806a9f83282487b10c5a8ba1473a877c5ea4b5dabc59a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/award?keyword=e+verify+poster+2020+pdf PDF link annotation
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/59bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fdb7c117c48c.pdfIn PDF document text
    • http://jobware.pro/arcsoft_totalmedia_showbiz_3.5_downloadkv4k7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fe992a908881.pdfIn PDF document text
    • https://nijikubu.weebly.com/uploads/1/3/5/3/135347783/157042230de8bf8.pdfIn PDF document text
    • http://bridgecommerce.com/50087761952azlz4.pdfIn PDF document text
    • http://hookup753.fun/used_delta_10_unisaw_for_salei1el0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_600fcba4851aa.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/280896726.pdfIn PDF document text
    • http://uscovidcharts.com/17616314168v28k8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_60136d5c491d9.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/e6ed3ed5-5925-41bc-9ce3-5987f5349808/how_do_i_hang_my_samsung_tv_on_the_wall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c2e67a-7ca5-4cc2-a922-a271c7599828/harry_potter_books_in_order_by_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7453fa8-b3fc-4a9d-93bd-e0503d02d6f3/why_we_cant_wait_google_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303f5219-485b-455a-b913-5cabbb9fc8e7/samsung_s9_specs_and_price_philippines_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a325bd-9926-48cb-8d06-a1e57ac999e0/32364183276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb773e67-f79c-422f-bedc-e2806d6fe250/puwagajimavizidigij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c45f25c-d8ba-4b64-95f4-e62a1663e97f/57170659750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7a58f0-3462-4c7a-add3-addc43ea38ac/pathfinder_kingmaker_best_weapons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce6777a-cd9d-4fcd-a91c-88c5e2ca67d9/himmelblau_balance_de_materia_y_energia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44e1b6c-b74d-4647-8788-392fb9189ba1/lejusitawopaza.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_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 5184 bytes
SHA-256: 3cb6d257364417e63d401b810d7310eb9cd47960a5ea4ffcab1d2db49003d8b8
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 12656 bytes
SHA-256: cd1fdc4288a8a1852e2846a87af2bfddba830dc0108d6fbb238eabdf9a6eca0f