Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1cde6e0bdb6200…

MALICIOUS

PDF

94.2 KB Created: 2021-03-25 14:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce124c8538d335bf65ad10c7dd1c5dc8 SHA-1: 1571a69e0b973f72d45d49bc070721ed7d44f8f8 SHA-256: fb1cde6e0bdb6200343da5f28fa8a308e5339ad1fbdcf75859bf9c57333bc1b0
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/award?keyword=synonyms+and+antonyms+pdf+for+ssc+cgl PDF link annotation
    • https://cdn.sqhk.co/pasededi/gjgIhcA/whatsapp_transparente_apk_ultima_version_2018.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/64615654279.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/chaib99/82249821079.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/direct_oral_anticoagulants.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvivemu/hhfgjYE/tofutefomivuvamepurajavoz.pdfIn PDF document text
    • http://2020coupons.info/kawasaki_jet_ski_serial_number_decoderus6m0.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/bipolar_disorder_checklist.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/quick_summary_of_13_reasons_why_season_3.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/SQNugey/nipegilutaponosokotij.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/bukapanapiku.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/valefiliwujoru.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/wigZ3Ru/roku_remote_app_for_chromebook.pdfIn PDF document text
    • http://mklhhhh.space/fetal_development_bookigyt1.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/xazowizuned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/29c0177d-4653-490c-a3bf-0700c9ed175b/is_the_cissp_exam_hard.pdfIn PDF document text
    • http://sugunava.epizy.com/putetukifogi.pdfIn PDF document text
    • http://papujov.epizy.com/just_the_way_i_am_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5308813-cd72-4aaf-8c3e-d75890a8b384/87369937672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2058c1a-41c0-4357-8be7-88486fd142b9/jijovitebajoxobekovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798e245c-f882-47f0-8762-600d2b1d3333/9862404703.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 5300 bytes
SHA-256: 4b022820e3f8de73ea8838fee0c9b98dbbe1434dabe29007a23206b883901b7f
font_01_sfnt_off00013627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 11528 bytes
SHA-256: 127b47ce82ab5d4d4367201fe65a6f717fc6e7f1169e038762c554be16863b55
font_02_sfnt_off00015d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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