Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b18fb8217b2136…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 10:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4d7020f58036099be34ea4cff50a5edc SHA-1: 42dc022b208af8d91a61c848ac876adebe5849a6 SHA-256: a1b18fb8217b21369d961bcc0f4f342f2dfe1a57d6f64dc7fb96fcd88c3f1e9e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to a suspicious domain, likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, appears to be a lure related to 'Furby connect instructions', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=furby+connect+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fdc3c379dac6.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/zugebuxekukedi.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/2e38b590.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/gekuxojobenimoje.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/waluxijevoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_6022626c54f90.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/00ed623284728fe.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/bankers_adda_current_affairs_capsule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_602a442488f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fd2dea44e802.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/colonial_comparison_chart.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/catholic_encyclopedia_farley_edition.pdfIn PDF document text
    • https://zunovuxosuseso.weebly.com/uploads/1/3/4/4/134497136/gafif-verepedewilo-siwekan.pdfIn PDF document text
    • https://fuxomiluzixoxam.weebly.com/uploads/1/3/4/5/134594746/281985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba99098-b6a3-456d-bb9b-4f2a649bb9f6/pathfinder_2nd_edition_class_guides.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_08821b828a4a44f1b1339a360e95da4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d151247-94bb-442a-af2d-3de795c89531/12_days_of_christmas_lyrics_ptx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e440344f-f08e-46c8-b1e4-0a4235c1413d/wukuba.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_330dfd272f0249bda272e94f2f408b27.pdf?index=trueIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/zapapudulabovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30142c8e-665b-43d7-8167-5b2f0887a008/66998049771.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_8374356159594629a703bdd8d8a54300.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe42bcd-18ca-4234-b5d8-cddb5a680c9a/who_is_gonna_play_prince_eric_in_the_little_mermaid.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 4748 bytes
SHA-256: cd4b03f77d22a8494e2d8093871a4e7b3f60cf742b207af0050d620229f288c3
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 11588 bytes
SHA-256: 487c1bb120cbe51bfe5c15a2531d6599356adffda1f216ccba592cdfc4f7ba5d