Malicious PDF — malware analysis report

Static analysis result for SHA-256 4194a107946067b3…

MALICIOUS

PDF

89.9 KB Created: 2021-04-27 06:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95af74f4c45ab710e21df8b73829dcce SHA-1: 77e92700e37e70dbc7b729a703d03cd6b33f64a4 SHA-256: 4194a107946067b38f114e7d292bd69420db8057040758fea643b45b723b9ccd
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on 'https://xezojetit.ru/strik?utm_term=baby+einstein+neptune+jumper+review'. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the high number of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=baby+einstein+neptune+jumper+review
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fca274da125f.pdf
    • https://cdn-cms.f-static.net/uploads/4485926/normal_601dd0d0495f6.pdf
    • http://romeoplanet.club/how_long_does_it_take_to_read_the_bible_in_90_daysv2v27.pdf
    • http://filemarker.store/xasosonapurakumiroxawon1g88b.pdf
    • http://wuduwoguto.22web.org/nugugus.pdf
    • http://comforfemj.fun/panulixizagipyapk9.pdf
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fe69b2178eda.pdf
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fcb06728345e.pdf
    • https://static.s123-cdn-static.com/uploads/4485587/normal_5fe09e86d24f1.pdf
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fcbd8f7999de.pdf
    • http://batmbatm.ru/calibre_perc_user_manualnem77.pdf
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600fb4e8bac77.pdf
    • https://cdn-cms.f-static.net/uploads/4375896/normal_60618dec60b2e.pdf
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ffd00c2dda27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zofududa.rf.gd/81446822010.pdf
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_f8f10571ddc84355a951694ccb18a51c.pdf?index=true
    • http://botogokobule.rf.gd/malebopabunusiragaren.pdf
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_15998adc2b35445da7a53fefcd5c65dd.pdf?index=true
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_d6f63359c2ce4696a28c4db6f52af4e3.pdf?index=true
    • http://mobosefevexaxep.rf.gd/advanced_wastewater_treatment.pdf
    • http://lajirobodogew.epizy.com/fannie_mae_gift_guidelines_2018.pdf
    • http://birijigasexow.epizy.com/dijiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d7.bin
af7d5c5248a2b7dbbbb026e62eabb00f4e9914d63b5b669dd5ce4747cd39442e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 5224 bytes
font_01_sfnt_off0001268e.bin
a965761bc0737e9b2a0d0dce3b7fba156d035199a349c014bc3af367fce1e41c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10996 bytes
font_02_sfnt_off00014bfe.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFE 4324 bytes

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