Malicious PDF — malware analysis report

Static analysis result for SHA-256 792536b1273d2d72…

MALICIOUS

PDF

54.3 KB Created: 2020-11-06 13:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b20e04adf32a9a9bc8f9db26f4ee1be9 SHA-1: c91049710feb0423bf8a46e47747e38d78e6f4fd SHA-256: 792536b1273d2d72ed772a3779a0514d434e20e0c619477157d3861e606d25a6
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://trafftec.ru/aws?keyword=heavy+armor+master PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5f94c4a7b4776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f90ef2e15698.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/fff56f798.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/025a7d4205c4010.pdfIn PDF document text
    • https://fupojipivub.weebly.com/uploads/1/3/4/5/134525069/livulibapojawi.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/e2400917f29c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5f9056710befe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f95b60c6f03e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_5f9e7ccb29851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87599ef1578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f961432e9f03.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8427161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f94fbcbe6bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f97a9494fe9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/fadiv.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_off00009568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9568 4924 bytes
SHA-256: bcf05a0dac52419f464a246053f7226f47a81ed1577dc86aaa4408a1c95fcd5f
font_01_sfnt_off0000a619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA619 11496 bytes
SHA-256: b469bc2c8cafef8e97e740166bceea826a9e469fb0656d91c2a9b81901df71cc