Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b0d4a7643c1018…

MALICIOUS

PDF

85.6 KB Created: 2021-03-13 18:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 13d4da4dc7c0c6db928218814f3f7bb1 SHA-1: 7c96e106da62fb4eedd10f23fb33ef4747ab449d SHA-256: e8b0d4a7643c101891f3b6e73f3f9d5d3e06a20091bb136c61106fc5a597e668
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 phishing or trojan threat. It contains numerous embedded URLs, with a primary one pointing to 'pelibifir.ru', suggesting a lure to a malicious website. The document body, though heavily obfuscated, contains references to 'gallery apk for android 10', reinforcing the phishing pretext. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pelibifir.ru/wix?keyword=gallery+apk+for+android+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445564/normal_60468dbd10f5a.pdfIn PDF document text
    • http://rutonujak.iblogger.org/reporting_issuer_means.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_6041b3f360d7e.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/e34472d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60186499a393a.pdfIn PDF document text
    • http://ifeelgood.club/italian_made_music_boxes4jk9f.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/1070166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fcfb8d8e3823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5ff31f0e49dc0.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/xelivara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6012c37a5ce19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_6007be5fc6a55.pdfIn PDF document text
    • http://fokuwezowixo.iblogger.org/8558131183.pdfIn PDF document text
    • https://bosopezimewuzur.weebly.com/uploads/1/3/4/3/134313362/db848b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_602c31f4436f5.pdfIn PDF document text
    • http://tonobipuko.iblogger.org/fiwevomig.pdfIn PDF document text
    • http://littlenat.space/vexuguwexh338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_6008eb57608aa.pdfIn PDF document text
    • http://jushq.pro/834337859525wetz.pdfIn PDF document text
    • http://autokenn.com/rawunij0u4.pdfIn PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/xusap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabesazuxipuf.epizy.com/68288703191.pdfIn PDF document text
    • http://kumodifusimut.epizy.com/long_john_silver_coupons_january_2020.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/ao_smith_takagi_tankless_water_heater_manual.pdfIn PDF document text
    • http://taxivufiwe.rf.gd/bevolexedokunowamoduf.pdfIn PDF document text
    • http://jimatisejur.rf.gd/38208881976.pdfIn PDF document text
    • http://vaxinot.epizy.com/ccna_material_2020.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 5248 bytes
SHA-256: e5cab4d25308162d9715931214401ac7bd04c71e016f26e2875696bbc13cb261
font_01_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 11084 bytes
SHA-256: e844c206f72a6dbe708f1019fa32e4128e474939aec4a2466e3eec9c5bf4c4f3
font_02_sfnt_off000133e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E1 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330