Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba243a3bd6a3b9…

MALICIOUS

PDF

46.3 KB Created: 2020-11-09 15:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a5d8fb0875ef2e469e2b6306f49a9774 SHA-1: c285efce91c56419af9b2e8db1b67227f6f2071d SHA-256: 67ba243a3bd6a3b9a614bffe9ef038fd0eab063e67609dd441f6c6ba7cf9563c
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://traffking.ru/123?keyword=1040+form+2019+schedule+se In PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/8170474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f86f698e8128.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/3029088.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/5683756.pdfIn PDF document text
    • https://kilesikawagex.weebly.com/uploads/1/3/4/3/134372597/vapofovufanasalapo.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/legenapi/abdul_karim_md_upland_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/hot_dog_bush_unblocked_games_77.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/46153476371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25620db-101a-4d84-b3f3-3b04cb4b91f5/gobipixigejubefenosabusa.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/mrs_garrison_south_park.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/definicion_de_ontologia_segun_autores.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_off0000601b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601B 5528 bytes
SHA-256: c54248786efd076d48f1471fef903948bd83a5e9c689a85b7fb53a16020c09fa
font_01_sfnt_off000072c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C7 10816 bytes
SHA-256: c6dcc3e4729bd96497fa2691f645c4e7b297fa47d329fd24abf93e8711f6602e
font_02_sfnt_off000097ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AC 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67