Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abbfcb3f522c04e…

MALICIOUS

PDF

47.5 KB Created: 2020-10-07 12:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5f71c4ce27d7404a8c6bd9e48365bf0b SHA-1: 0c896ee12af1a97e1f88dae47926b3909abbd93a SHA-256: 5abbfcb3f522c04e9c1154c2cc345a2a5aaf21955e40eaa9cf9448c120dad08e
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://ggtraff.ru/strik?keyword=veterinary+books+pdf In PDF document text
    • https://site-1042716.mozfiles.com/files/1042716/wosudoxuligi.pdfIn PDF document text
    • https://site-1042658.mozfiles.com/files/1042658/38650506638.pdfIn PDF document text
    • https://site-1037262.mozfiles.com/files/1037262/89401301181.pdfIn PDF document text
    • https://site-1043686.mozfiles.com/files/1043686/26543726979.pdfIn PDF document text
    • http://nuzodape.jjohnsonartist.com/uploads/1/3/1/6/131606295/cd7dd.pdfIn PDF document text
    • http://files.bevpurduefineart.com/uploads/1/3/1/4/131453818/f6358b0.pdfIn PDF document text
    • http://wewifizal.annkellettghostwriting.com/uploads/1/3/1/6/131607240/tosevipemegutak.pdfIn PDF document text
    • http://files.hlfmgoats.com/uploads/1/3/1/3/131383553/jopaxubesoz.pdfIn PDF document text
    • http://gagon.dressagewa.org/uploads/1/3/1/6/131606140/12184b98.pdfIn PDF document text
    • http://files.kenmaremindfulnessandyoga.com/uploads/1/3/1/4/131438692/rojoresil.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/1/0480/4742/3652/files/jovixofupowovulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3908/7002/files/pathfinder_bestiary_5_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5055/5799/files/most_holy_trinity_church_saco_me_04072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7242/5636/files/protein_modeling_science_olympiad_cheat_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/wii_connection_error_51330.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC8 5272 bytes
SHA-256: c9b127c7dade4660587a5ae36ea7a0bfe613adbd9129845353e26d2d23b985a1
font_01_sfnt_off00006fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCD 14000 bytes
SHA-256: ab60cb7db9b0a97dfb549cffd4744e2d1eea73cd4380be908b5269cf2a5ba165
font_02_sfnt_off00009c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C31 16108 bytes
SHA-256: 9096c4cae0a898e845a9b8ee28cf649910965f4cfa03df72d9f32db2120be819

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