Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e374362e9918331…

MALICIOUS

PDF

70.3 KB Created: 2021-02-23 07:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 53f4afc9b142523990fafeed859b3e0a SHA-1: 1cba81217903ddf688f47608a2b426741dd54981 SHA-256: 1e374362e99183316eaf5d301f88c9e7b3b7acd03329db85bd16c4d9b477ed93
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a firearm serial number lookup. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=colt+1917+serial+number+lookup PDF link annotation
    • https://cdn.sqhk.co/kawurefeki/LTcjjjf/lowcy_duchow_2_pistolety.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_602fcdf50955a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fdf4b4503b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_601e357854067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5ff01db2c269a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493881/normal_5fc95fa2572f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5ff7896640ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fd3a33667046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_603172ab6a4f2.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/5777870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_600fcc0a220f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402032/normal_5fdf095101745.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/sumesawoxajew/cursive_writing_alphabet_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/az-_900_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/warrior_cat_characters_names.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/bonitasoft_tutorial_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/car_selector_gta_sa_android.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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5364 bytes
SHA-256: de954143c845c1248cb22eb95e9829993b6db31bb8fd8cb3234d20241ff6317c
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 10420 bytes
SHA-256: 36c3836588ad3524e7f956c3427972e64593049635d1daa24e9e9d6236d8c06c

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