Malicious PDF — malware analysis report

Static analysis result for SHA-256 01328c45b21a4db5…

MALICIOUS

PDF

35.7 KB Created: 2020-10-31 07:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 850a7ccf917a7fb740268941a24e1e18 SHA-1: 935da97b44258d5362e6c8a1e330c7adcc47024a SHA-256: 01328c45b21a4db58e0f73c1bab1d23d1e0d461c9ed6095bae09646f2177571d
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/aws?keyword=elements+of+language+third+course+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8f8aea5291f.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/zobipovop.pdfIn PDF document text
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/puxupivokoguzafumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5f9c96901acf0.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/mokitegowaf.pdfIn PDF document text
    • https://gupugeja.weebly.com/uploads/1/3/4/2/134235999/57141bfa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f908cd429b82.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/bijupus-xebifenirijun-vebejemabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5f94e22d52985.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004a4b.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004a4b.bin)
    • https://uploads.strikinglycdn.com/files/c112464a-1e14-4692-aeab-713c2df4ac15/slide_flip_or_turn_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e1076f-6a8e-456d-bf3b-1dd1e57bfb13/70081050890.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 extracted file (font_00_sfnt_off00004a4b.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4B 5648 bytes
SHA-256: d5799bfe01f68f109428cb1f77074e6a06e4d4a6f09dde71a9e54119c0f2f7f1
font_01_sfnt_off00005d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 11340 bytes
SHA-256: d5730b6b53cd435e45e1ff937342c5b39ced3b7d2874f45c3c31e2c4830c92d9