Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18b88fddb8402e4…

MALICIOUS

PDF

138.3 KB Created: 2021-05-09 08:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0eb1376aadfd74fe9a7428c6574b871 SHA-1: 12c093cf85041460f5506387e9852328c3a6673d SHA-256: c18b88fddb8402e4017e598e8a7e9a5bfc77a48e23b6f2d3c915eeabd4805b53
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The primary malicious URL identified is https://xezojetit.ru/strik. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=kindred+octavia+butler+movie
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/bijiwagod.pdf
    • https://babuluvenan.weebly.com/uploads/1/3/0/7/130739113/8879333.pdf
    • https://punulizi.weebly.com/uploads/1/3/5/9/135957491/1630042.pdf
    • https://cdn-cms.f-static.net/uploads/4466140/normal_602461f263e52.pdf
    • https://cdn-cms.f-static.net/uploads/4410983/normal_601f29253e7ab.pdf
    • https://cdn.sqhk.co/jopuromug/Lmj5if1/favo_de_mel_milton_nascimento_letra.pdf
    • https://cdn-cms.f-static.net/uploads/4372737/normal_604fe61fc350c.pdf
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6037331e64444.pdf
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/podudabalapa_wuribagifiga_liwatotunab_kededanix.pdf
    • https://cdn.sqhk.co/bopelara/mhcja27/murder_hornet_nest_washington.pdf
    • https://cdn.sqhk.co/xumefotebe/iaoDGia/qs_world_university_rankings_2020_dentistry.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_942b1f20619240ff87e9c36dd34e025f.pdf?index=true
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_7105d62c2a164f22a822618404bbac57.pdf?index=true
    • https://uploads.strikinglycdn.com/files/434c5bed-7da3-49c7-b9ff-90b3c0957fd0/watch_alfred_hitchcock_the_birds_full_movie.pdf
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_e0727c9c9bc047b789b5b573617f9a87.pdf?index=true
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_cdfcfdf2206e4687bb68fff9ae50fc66.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b72a36f-58d6-47b7-b0bd-9cf4e942e293/25837486042.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_999107c465c141e599d43de3b4ad0788.pdf?index=true
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_2709a229b54647778dd1ed2433b09a5f.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_9652e7e8263a440fa95750903df92baa.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_aa221b26515b4d689445fa70ea0c7fcc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ef4ceac-8fcc-4035-9761-879d637a0a78/94061077782.pdf
    • https://uploads.strikinglycdn.com/files/9511aaa6-e970-4ce0-a9a5-4bf6fbb9be16/piwibadefesuzoronagobadu.pdf
    • https://uploads.strikinglycdn.com/files/e768a348-a317-4d90-a288-01274e8042d8/what_are_the_factors_that_influence_ethical_behavior.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e10f.bin
b96400bcb9ef45dee39e6525aae4e118e5491e0a8bb2e1ea1498cf87785a3da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E10F 5076 bytes
font_01_sfnt_off0001f248.bin
a06804a2919b4322aac6f6b78ca0ae2b0a75958b675fb42cbd16c9593945703e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F248 12464 bytes

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