Malicious PDF — malware analysis report

Static analysis result for SHA-256 f345f3a4626d7f74…

MALICIOUS

PDF

46.5 KB Created: 2020-11-09 08:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 048ddb4f263c392b44a90eb31c734401 SHA-1: a9a8c4271c6521784fc14d8867335ffcf8ce4183 SHA-256: f345f3a4626d7f74223898b8a634613dc221535ac19037f347e37cc54aa2f516
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://traffset.ru/123?keyword=how+to+plot+logistic+regression+model+in+r PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f9cc23cf11ef.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/aee47aed9.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/bfaf9.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/f2760f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://forakufu.files.wordpress.com/2020/11/cengage_mathematics_coordinate_geometry.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/simpson_maker_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/magic_elements_reborn_codes_wiki.pdfIn PDF document text
    • https://binapufa.files.wordpress.com/2020/11/12979992905.pdfIn PDF document text
    • https://futelura.files.wordpress.com/2020/11/fanelem.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/nekeguwe.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/45315232022.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/27117714990.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://fazizanubud.files.wordpress.com/2020/11/zeluzavufaveji.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_off0000738e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 5236 bytes
SHA-256: 46cd08b8dcb7a85277702d5e6f93e4df6c87e4516396cba74d620f7a89549789
font_01_sfnt_off00008564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8564 12276 bytes
SHA-256: 75ab65ca988c951820bb406c2722eb47ae3e526f33127c4beff606489bad56dc