Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f276a3432054932…

MALICIOUS

PDF

54.7 KB Created: 2020-10-17 17:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5541c38c98b3c4335347a57540ad722f SHA-1: 80f6495ee70229583573e0e3c4edb2527c56a9c4 SHA-256: 8f276a3432054932f4a7a786c591e87ece5034a43e40a744f5d84831837f7af5
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/strik?keyword=al+ajrumiyyah+arabic+pdf In PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/8457194.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/37ffbd.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/mofaropudowonorik.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/4182938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f8925450c59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86fe8cd2c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8a1a69502af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f882c7283a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f87a917f379a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8a56f06914a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f8a7cd7015d4.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/c1aa9552-7897-4f6b-b4fe-0546682b3dfc/tokop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1675ee20-bbc1-4390-b4f1-41d87f333113/tumabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa489eb-096e-49a1-b1bc-8e6117e911d8/56167239161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76df6829-be7b-42cc-95ea-ff641f53c9ee/93408915046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c2a3c1-4c1a-4515-b96b-1e9d0a39782a/tipipizumatofafopujupexuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7f6246-ee1c-4aad-a61b-15c49cbcb61c/zufoxawakowofiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001869c8-9dc3-4f37-935c-df9fab7f6a51/lometadixipokazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bb0b4b-884d-46c2-9c4b-f03b6e09f86f/gikizidonuzevudipuja.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a308.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA308 24108 bytes
SHA-256: 9a60dcba4c5828a5ecaa86eab81796209f11de4054464f5d0ee421928b96cb03
font_00_sfnt_off00006d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 5524 bytes
SHA-256: 2eba6052d4d17aecad50d4806b21d925cc12e5f76f35793a36bfbfc260c0c355
font_01_sfnt_off00007fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB8 10324 bytes
SHA-256: d517f619bc9af9df9ffd7174b6167f5e222e4fdb7eb7c248536d3ab01cb19ca9

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