Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc33426be215d8…

MALICIOUS

PDF

52.8 KB Created: 2020-10-02 11:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f5b750436dff16dd8ffc2d2eb68b0c40 SHA-1: 31b966dca1656afb16c9bb5d1b59eb6c03bf1bdb SHA-256: 81fc33426be215d89dd694db64094c2397f25cef4c88628c88489c5d5ed25b68
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://ggtraff.ru/strik?keyword=removing+watermark+from+pdf+document In PDF document text
    • http://files.talltalerabbitry.com/uploads/1/3/1/0/131070327/laxesejojuk.pdfIn PDF document text
    • http://wajupo.suumc.com/uploads/1/3/0/7/130775666/3e26341a7.pdfIn PDF document text
    • http://zorowevul.smokeandfirecigars.com/uploads/1/3/1/4/131453134/342df8667630.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/d191b0a5-fdf5-481e-ad26-f980ed20ed65/nizog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b71048-7ed7-4e44-97bc-5c70a2da0721/kabewopedexegitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e4a797-9215-411f-8c82-8e461de75076/24350515673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f19904-7dee-49d0-91b1-0f15d723b084/tazoteluvodimafibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82eb43c-b91d-41fb-beb7-e463343f57db/wesasofomofegidorulun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9fbefe-3e0a-4e5a-8784-b198a2a9d3ba/sovolijunava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474b9099-b07f-4090-a21b-ecb17b2f3a1c/45876597266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c143c5d1-933c-4648-a604-b599bb2dfb45/fixosotexopitonote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3056e844-e023-4ec3-8a5b-8fea50ec5c22/45859581518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54322f1d-e720-4a56-a898-c1695a7c3563/70578505953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6479dbe-8141-4753-8d21-a954a2017269/36683691577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c55ab9f-ec5b-43f9-807a-4499c84eb6cd/roniberawojovobanit.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_off00009127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9127 5488 bytes
SHA-256: 04ee1a4743dd3616a9942d2c773eb975f607f9795f2132d9a3e32ebd6c85fe90
font_01_sfnt_off0000a3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3DF 10116 bytes
SHA-256: e6efc73c973a7c8a9f46bb4baff62f238fba1aa2b19c32dbe4e503624a629d3f

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