Malicious PDF — malware analysis report

Static analysis result for SHA-256 da30f91de8e76486…

MALICIOUS

PDF

47.5 KB Created: 2020-11-07 07:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f36c561366322567c8b2587c1a4828f5 SHA-1: 10d2c6098d4469bc9f1e5a28693aba47461cc15d SHA-256: da30f91de8e76486f9a54bf0f84c57762ef77b7adcbc82f6fb8afb5e503f7bc3
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://trafficel.ru/wb?keyword=nhac%20tieng%20anh%20nhe%20nhang%20sau%20lang PDF link annotation
    • https://bitifuzafaf.weebly.com/uploads/1/3/4/4/134488734/533ef4599c6bb1a.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/rubademef_gepivizes_buparafetepulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisazabe/50299313958.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/1941_chevy_coupe_chopped.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/operations_research_wayne_winston_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/nemikopakifusegomogudurod.pdfIn PDF document text
    • https://kadurenokadi.files.wordpress.com/2020/11/xuxeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/74753042280.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/diferencias_entre_meningitis_viral_y_bacteriana.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/philosophy_of_the_arts_an_introduction_to_aesthetics.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/bipasa.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/solubility_rules_lab_activity_answers.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_off00006776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 4936 bytes
SHA-256: a723e893481f61d1bdf1c706d862391ecd6ec4aa4e511dbeb7cf44e733d77872
font_01_sfnt_off00007843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7843 10196 bytes
SHA-256: 0ae475f2f48e0050d1fa600402047fc1aabb35a3a6db83eaba406a01b034d73d
font_02_sfnt_off00009b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B58 16224 bytes
SHA-256: ba9a6c4b37cf87a14bc924ee15c240b11c9f3c53f7670bd68fd92753aad12abc