Malicious PDF — malware analysis report

Static analysis result for SHA-256 55257a45dff04519…

MALICIOUS

PDF

70.4 KB Created: 2020-11-08 23:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 6a69b29eb0d7679a43169cca50bc3b07 SHA-1: 014e695712ec243fb1d065572c62a19fa5132f0d SHA-256: 55257a45dff04519fde622a17c1ac2fd3551aade31715971274f59e4c041a90e
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?keyword=synonyms+of+replicable PDF link annotation
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/8962871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f8a6a57cd542.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/xusasepivaf_tejerilidibus_kilefojofuvewon_wejufuwupul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/davubewu/edit_documents_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/secaucus_movie_theater_tickets.pdfIn PDF document text
    • https://gobuwilan.files.wordpress.com/2020/11/6th_grade_math_problems.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/pukoloxutudikadijogo.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/celina_utilities_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/thinking_with_type_2nd_edition.pdfIn PDF document text
    • https://rakidate.files.wordpress.com/2020/11/rufirobolamopobujiki.pdfIn PDF document text
    • https://dogimevunij.files.wordpress.com/2020/11/68549314887.pdfIn PDF document text
    • https://jogamoje.files.wordpress.com/2020/11/focus_t25_beta_calendar.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDC 4892 bytes
SHA-256: 73781b773e74122c77f3495b5929ffba026fc552afdef3f54633d31d6385a8b9
font_01_sfnt_off00008ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CED 5212 bytes
SHA-256: 1d48fd64726c01ed7e0ffd230cf133d06c5af188cef95133030a171c504b2994
font_02_sfnt_off00009e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6F 5232 bytes
SHA-256: 9a2db8779875153e34bc48dba252b441cef21fef958e871a26b74d627204698f
font_03_sfnt_off0000af96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF96 13948 bytes
SHA-256: e2d6c0cc2ddd9ea84459582c6271130e2188f2a2dcff9d798b6c1747a8dfbb28
font_04_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16568 bytes
SHA-256: 3c946f1f8d32c2822e976587438a427e15883adf3843e2446ef02e6809b55497
font_05_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_06_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 3028 bytes
SHA-256: 6c1dd17236194deed7685adbf0fc50d98807d374f9e8e7b61aabe4e87a8c36a6