Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf5bf0b1f02d0d…

MALICIOUS

PDF

43.2 KB Created: 2020-10-01 15:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5a1db5c0ddc77ee33a647a52e6c84333 SHA-1: f30bdadf8e736e4b5de3b5886975b32bc46fa432 SHA-256: 4ebf5bf0b1f02d0ded9859d45ec56df893bed71634a7ad2c57c834336c300a0f
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/strik?keyword=ssc+stenographer+paper+2019+pdf+download In PDF document text
    • http://sezegigi.thelizrusso.com/uploads/1/3/0/8/130874114/fusugin-tujebogeg.pdfIn PDF document text
    • http://gipagal.lethbridgeelectrical.com/uploads/1/3/0/7/130776783/079b902.pdfIn PDF document text
    • http://dafuzimi.darilenepomeranians.com/uploads/1/3/0/7/130739704/dorefotosoweg.pdfIn PDF document text
    • http://werejewiv.cbksteel.com/uploads/1/3/1/3/131383771/3140264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/terariramiwik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/kisulimejom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1865/8207/files/47352861650.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6385/9605/files/geog_2_textbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/tecumseh_engines_manuals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/advanced_excel_topics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/pelusunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/48876791392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/lube_oil_material_safety_data_sheet.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_off00005db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB6 6092 bytes
SHA-256: 7418d16d97fdf70ea9ceab1365a2503f27c473a87745be362240cfd9b23cafd5
font_01_sfnt_off00007287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7287 14528 bytes
SHA-256: e05d0e56dcd2f4157e35970f3842be01cf4915207c1e01fa97cac132f9331552