Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b1b913cfb91edf…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 05:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39c01023cb0119bca9fdf9034eb972a SHA-1: aa396d98e3c09b6942d96ba23995b001012ae12e SHA-256: b0b1b913cfb91edfc3ca798d60e13221ab1fd31eab2052359d771e4cd0510bfa
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to other PDFs, suggesting a link farm or SEO manipulation tactic. The presence of a 'download' lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' indicates a malicious intent to deceive users into downloading harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=pof+mod+apk+download
    • http://pazadixokumox.sportsontheweb.net/cancionero_para_guitarra_en_espaol.pdf
    • https://cdn.sqhk.co/gagufatemo/Hjfn8jg/traffic_road_signs_meaning.pdf
    • https://cdn.sqhk.co/kunagukojoxu/YV6FfwY/simple_smart_launcher_themes_hd_wallpapers_1080p.pdf
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/38c8cbb3568.pdf
    • https://lelazasizegaki.weebly.com/uploads/1/3/4/4/134491428/a69c630ecc3.pdf
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/7160001.pdf
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/riguxer_zaxelotowutomo_mavoku_dinepekerudo.pdf
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/lezageta_todolumu.pdf
    • https://pujapuvefebawu.weebly.com/uploads/1/3/4/5/134581836/jaxizilekivuxakasav.pdf
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/46e335a0b216a4.pdf
    • http://adanakebap.org/88267901470itf2j.pdf
    • http://pressit.space/finland_education_system_documentaryqtrjt.pdf
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/vupitokebunibaz.pdf
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/bavofa-fumelax.pdf
    • http://ighelperscenter.com/nukenebusevabemats8rg5.pdf
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/ee4c671c9960.pdf
    • http://hookup750.website/naruto_shippuden_299zb4iq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mapitixonemo.epizy.com/what_college_is_sports_management_in_tamu.pdf
    • http://wesatume.atwebpages.com/gametogenesis_in_mammals.pdf
    • http://jakukimokop.rf.gd/vafugoleji.pdf
    • http://wurezeradepup.rf.gd/5th_grade_math_vocabulary.pdf
    • http://kitivej.epizy.com/63095469816.pdf
    • http://jarebavax.epizy.com/arduino_filetype.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_off0000f28f.bin
c24ec3787cf2bd3a2d0f9dbb671059e65dff7c238ecc262e420b3c58392cc8b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 5072 bytes
font_01_sfnt_off000103d6.bin
bcd6edb61b2fbed11702364cb28db188f2f3f6118e410b2a15beadc2b1e42a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 11232 bytes

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