Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc7931810708440…

MALICIOUS

PDF

39.5 KB Created: 2020-11-07 09:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f1997e6edab5536d08c700d0fb43ed3c SHA-1: 11252674debfb57108bebfa3c7c6acc436dde9be SHA-256: 9dc7931810708440c83542b5766f7eaed8b13c52f970b04b5ddc4224dba243c5
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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://traffset.ru/aws?keyword=singular+and+plural+possessives+worksheet PDF link annotation
    • https://tijaworiluwulu.weebly.com/uploads/1/3/4/3/134363233/7658033.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/a2089410.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/b3e16a1d-e070-4d81-8dea-26d793aeaf12/zokodutibuwukedefunelibaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784d7d1b-0071-42fd-8855-dee1d5c490f7/86827630602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2798a26-21ac-4b52-afad-f30631d65c81/1889428861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4390e1-0ceb-4c3f-80eb-42e8b7c1b167/63888211093.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/ultimate_paleo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/20226577107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f021f5f6-3701-4b5f-aa6d-6f3aa9763429/72811961003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56044402-18fa-4b99-b007-f3692f6398f3/46033869754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a64ea0-d8f1-40b5-9c04-d72993b61057/badinubuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd12c9bb-76ba-430b-933d-35c8e2770ad8/namafisaxinixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0471a594-542c-4ab7-ab17-00d55ed63adb/50801505224.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_off00004c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C99 5424 bytes
SHA-256: aa604c938d420aba2935ba312c08d3e3e3c8e949e618dc86c698b463df19eb85
font_01_sfnt_off00005f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F09 10472 bytes
SHA-256: 42f36108e65812ff47055e2ceae2f6b2df8626cc5d4603bfb888759249929581
font_02_sfnt_off000082dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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