Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7224cda04e5ecc…

MALICIOUS

PDF

79.5 KB Created: 2021-03-12 02:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b28ebdecf0a5aa4cb74d4f456a2d6071 SHA-1: 4925752dc409b5a8b1d8000c7162796a85c0323e SHA-256: 5f7224cda04e5eccd47a029a3d993b81b7247b44d1f7a8a480e8180ac31222de
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a link disguised with SEO-friendly terms, directing users to a known malicious redirector. The presence of embedded URLs and the ClamAV detection further support its classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/123?utm_term=function+of+liver+in+digestive+system+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601bb398487d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_5fda144af04c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fe82451e4ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_602c253654030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_60341b1dda13f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ffe2a28b2bae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/87a28666-e18d-4371-828a-1428b005d6a3/how_to_use_data_science_in_manufacturing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabec640-7552-44d2-961d-8c39a5806a53/samsung_dishwasher_error_codes_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20b5ac8-b32c-4c06-b8de-7864ac21e814/20996722354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2de9c8-931c-4630-9b4d-c14817166d93/how_to_reset_danby_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5ed706-50da-40a0-9503-4694262c53f9/xijizapezun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4aea61-a189-4f48-b5bc-d3a94c968e84/la_amortajada_mara_luisa_bombal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f2a5c6-b062-4de4-94c5-0e64375c9927/what_is_my_perfect_diet_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143502f7-5a22-496e-80a1-46005d8137d8/house_design_apps_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc993eb-780b-436d-994a-21bc36072ae8/35601869684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aea73ae-ea3e-49d5-babc-aff09408b42e/how_do_i_setup_wifi_on_my_element_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656f0707-acaa-402b-81eb-f49c5d2aa9ef/supernatural_castiel_and_dean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45d2119-69e3-4209-ace2-785fd5b90abe/45443504820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4061883-6bad-405f-9e0d-3bcad63093cd/6443620067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a022630c-ac9d-4d4e-ac88-e1f6e419c523/d-link_dir-605l_ieee_802.11n_wireless_router_included.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 5264 bytes
SHA-256: 4aa3d8c8db8c51b35996b07b3373780e650a7acb46d25483ede8e0384f61ec0c
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11288 bytes
SHA-256: 0a803c4fe06d28850e82c08d6385966c2bd215fb50aabaf64ea15966ae740252
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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