Malicious PDF — malware analysis report

Static analysis result for SHA-256 0471b09e86cd52d4…

MALICIOUS

PDF

85.4 KB Created: 2021-03-11 17:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ca3c82a71ff04b257be6205af22bcf6 SHA-1: 10f39586e8fd325993293ad2f8136e425f1b270b SHA-256: 0471b09e86cd52d4dbadd0a76da1853a5b539dfb3e2cacdd6cb65f26063ed41c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9998

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://golowaki.ru/wix?keyword=caritas+of+birmingham+ewtn PDF link annotation
    • http://bestsaleshopin.xyz/16803349037va578.pdfIn PDF document text
    • http://fiwamixos.iblogger.org/atheist_bible.pdfIn PDF document text
    • http://votilabelomebom.iblogger.org/63668612623.pdfIn PDF document text
    • http://itali-big.space/83111522967jwyfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_603fa697d8ad6.pdfIn PDF document text
    • http://servempieza.site/cognitive_psychology_jobsz4vvi.pdfIn PDF document text
    • http://esmoney.site/73004375011tygq0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fda9057d6808.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/nenuvepabarasuvxqpp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5feaf7a341480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_603436e6144ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601bb313b73d6.pdfIn PDF document text
    • http://goldenframecollision.com/2003_ford_focus_2.3_coolant_temperature_sensor_locationqq7ym.pdfIn PDF document text
    • http://maxitis.22web.org/checkbook_register_template_for_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokesuluz.epizy.com/2_player_games_android.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/slope_intercept_form_worksheet_math_aids.pdfIn PDF document text
    • http://jafimelivif.rf.gd/18430781723.pdfIn PDF document text
    • http://tosawos.epizy.com/free_kyuhyun_a_million_pieces.pdfIn PDF document text
    • http://satekivu.rf.gd/top_social_media_platforms_2019_statistics.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_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 5288 bytes
SHA-256: 619d93d453a17e44ad1750bbb6640971afcfe668d5f40aa2ef43b34fe5059786
font_01_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 10660 bytes
SHA-256: 6aa811284c360742f5c83918a0bd3aff02ad008fdd156dca2a4494b585155547

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