Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0bca560cefd31f…

MALICIOUS

PDF

74.1 KB Created: 2021-05-25 05:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d1e1637ec63930d6af51cac1b953f69d SHA-1: 24b3eca926b0be4d02f68cfb033236e1a2e68562 SHA-256: 8e0bca560cefd31fb1991b153756ca134c9856456b220324f7bc3bafd0e6670c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://maypoin.ru/strik?utm_term=castle+in+the+sky+cello+sheet+music', is presented in a context that appears to be sheet music, indicating a social engineering lure. While no scripts were explicitly extracted, the PDF structure and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest malicious intent, likely to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://maypoin.ru/strik?utm_term=castle+in+the+sky+cello+sheet+music PDF link annotation
    • https://bodivikofe.weebly.com/uploads/1/3/5/3/135332590/xavatafevulogox_risitakenot_wojixe_nekevegef.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/kalife.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/zekatojosavip.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/lepadaf_mimonoto_kebifuzuwaje.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/volebofodi.pdfIn PDF document text
    • https://jubitire.weebly.com/uploads/1/3/4/0/134017652/7619127.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/buforavizexodaz.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/dovulavavo/fanamole.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/kemufidawasixurifij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb45c317-dc92-45c5-8354-dd5750fcf5fd/33201276663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac05545-7834-4550-ba16-746ad87f4e47/why_is_my_freezer_not_freezing_food.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/39175188668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afd04de-5942-4f83-a485-368334c817da/msi_h81m-e33_socket_lga_1150_motherboard_price.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/26126885786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3537b75-9741-4566-8fc6-f69c860149fc/67523889514.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/free_gospel_album_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/english_grammar_lesson_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/79412374809.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 5012 bytes
SHA-256: 16484ba5eadd0257a38de2308057db597087b089d7d6c6aefd758b8840745c6c
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 11728 bytes
SHA-256: c1a1b5509b1fad46534527a1086802ab0155c6431baab04a8f299860664f3240

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