Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3209c96daaa9997…

MALICIOUS

PDF

67.2 KB Created: 2021-03-14 15:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2da9e5d912846ecdc00fc3db05248fb SHA-1: 744f647a58b71bf1f6ee5cc522dca8f3d681bccc SHA-256: e3209c96daaa9997d1b08a6f87f888fa7d2790e534484d449e762d27583e4bb2
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to trick users into clicking malicious links, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/award?keyword=jurnal+cacing+cestoda+pdf
    • https://cdn.sqhk.co/mujawiru/wFhfggV/hd_background_road_photos_download.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fd2e610e0611.pdf
    • http://fawikenaxalu.scienceontheweb.net/dell_vj4yx_rev_a00_specs.pdf
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/5657939.pdf
    • http://welifenepural.iblogger.org/pejizox.pdf
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/fizujulubesuze.pdf
    • https://zodurulamenuvud.weebly.com/uploads/1/3/5/9/135956643/42cda043f154.pdf
    • https://static.s123-cdn-static.com/uploads/4374851/normal_6008592cbb3ba.pdf
    • https://palekamenagogu.weebly.com/uploads/1/3/2/6/132682235/pinekobogibefat.pdf
    • https://cdn-cms.f-static.net/uploads/4374207/normal_60463577401e7.pdf
    • https://cdn.sqhk.co/wajuletixex/Bjqihhi/59898304460.pdf
    • https://cdn.sqhk.co/masamiwe/dgixtjf/spotify_music_and_podcasts_app_free.pdf
    • https://cdn.sqhk.co/foxidagon/V6sEEih/30636983638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/64409df9-0d5b-4f7e-bbb7-f6ef765d9761/how_much_does_chick_fil_a_pay_per_hour_in_texas.pdf
    • http://muliwavanebebo.onlinewebshop.net/cds_1_2020_maths_paper.pdf
    • http://toviliguzufefiv.rf.gd/ejemplo_de_un_guion_teatral_muy_corto_para_nios.pdf
    • http://dapizodipe.myartsonline.com/79633130267.pdf
    • http://varaxekewuveza.epizy.com/forex_candlestick_pattern_indicator.pdf
    • https://uploads.strikinglycdn.com/files/cd1fc1f8-201b-4ad7-86df-4414dab958a2/82795741338.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_off0000cb8b.bin
b7c84b457457c0aa27d7bf422178cb0d1aa1f365abed70fff35253f335444afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 5312 bytes
font_01_sfnt_off0000dda6.bin
9db5c2e02907e5441b88536dd8aa114cdb941d55cfe4991cfadcde4c459ba733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 9980 bytes

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