Malicious PDF — malware analysis report

Static analysis result for SHA-256 087ec0b8cc3585f5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-31 23:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 52e54dead5e9194192b833ee969db7f7 SHA-1: b8a726a7e8f799138645dce220baed349290fcb3 SHA-256: 087ec0b8cc3585f59efdd102fdfab8fc705ec64db8f35f24a58338436451aa15
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/wix?keyword=bible+reading+charts+free PDF link annotation
    • http://kyrgyztours.com/camera_test_chart5dsff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_604e8f09e580f.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/what_is_quantum_physics_all_about.pdfIn PDF document text
    • http://habercigo.com/cooking_merit_badgezg5tx.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/71524154035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_604b0d5e1d17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_603175a38323e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_600212a7294de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_5fd77b79e18d7.pdfIn PDF document text
    • http://ttop-shop.com/587114333373f5rq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_6033cc0851146.pdfIn PDF document text
    • http://kemedejovon.getenjoyment.net/what_is_behaviorism_theory_of_learning.pdfIn PDF document text
    • http://pakaxofuj.sportsontheweb.net/rajasthan_bstc_2020_paper.pdfIn PDF document text
    • http://tamakar.tech/tropical_geomorphology_booktipgj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fd37975ca961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_605f87f91a790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5fdc9f788ba86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_605849ce103ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_5fea1c8a66fbd.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/fixararololu/answers_in_genesis_magazine_coupon_code.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/megowilijeluti.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_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 5472 bytes
SHA-256: e5d79f40cd588fac00259a43b48d3aeee96afed415a26b506a2c73483a32fb89
font_01_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 10488 bytes
SHA-256: 38a9511b04195df0960a5c6a4220a95b13e92a9dd64924986af1756f2db7da9a