Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e9a53d0275dc52…

MALICIOUS

PDF

48.4 KB Created: 2020-11-09 11:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 51ef050c093cedeb0ea9ba75283c2be5 SHA-1: df3df32b7177c42a25b4b6956617cccf7763894e SHA-256: a5e9a53d0275dc528151c3674fe9dd1f6be20703b6400b3fbd0f497be9ca3d2b
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://trafffi.ru/123?keyword=unit+5+worksheet+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5fa26622a6d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f8b2d73f147b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f8ce9a795817.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/poxut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f8bb7f2542ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f8ad66759dff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_5fa67c87d02ae.pdfIn PDF document text
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/fc362aed5bd7d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8d58a84e48d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f911ee7d0242.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://s3.amazonaws.com/vazisi/buruzosurevakobizifaged.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/57278059809.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_off000071d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D5 4720 bytes
SHA-256: b17feb20f170d347a847fd12b154cd1c0fef8ce6b09820b106b2f5e3f0d43eb0
font_01_sfnt_off000081f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F6 10908 bytes
SHA-256: ea03e5be335a10505ddbe1aed44127555c1caa365cf16b2761286ad8b5baa56e
font_02_sfnt_off0000a71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA71F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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