Malicious PDF — malware analysis report

Static analysis result for SHA-256 591c657423006275…

MALICIOUS

PDF

108.7 KB Created: 2021-03-18 08:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cca02737edde86c6c96ccfac12b67573 SHA-1: aa12ac9c01feb09b4f6693d39103a894c63c7c43 SHA-256: 591c657423006275c0f3f5019c140c7aefddfad3fa213ed201c2caa19abf0d56
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure with a call-to-action button, directing users to a suspicious URL. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of external URIs and a redirector link strongly suggests an attempt to trick users into downloading further malicious content.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=example+of+chemistry+lab+report+discussion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458824/normal_601443e89b487.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/58695097406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409616/normal_6000eb177572b.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480891/normal_5fdfad20db30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6013158cedd02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/clear_internet_browsing_history_android.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/my_transunion_credit_report_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba28e7a-d15c-4c05-a313-5f490813c317/fg_knot_vs_double_uni.pdfIn PDF document text
    • http://kojavigetizafi.epizy.com/punjabi_audio_naats_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/15219635649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148039e3-261a-4130-99d5-d8aa74062be2/2019_ram_1500_4x4_quad_cab_big_horn_towing_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/camera_lucida_app_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964e49c4-046e-4609-8203-b14df2353b43/what_are_the_stages_of_piagets_cognitive_development.pdfIn PDF document text
    • http://zasegusof.epizy.com/50804503729.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/51337989393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6e4334-eec4-4ec9-8dd9-3e4aeb1cdd10/33199318491.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_off000152a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A6 5660 bytes
SHA-256: 503b750088b38f7e7f29eeb3102caf91ecc0ed3c8a4e32ab5e6d124f9d132ee9
font_01_sfnt_off000165c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C3 12276 bytes
SHA-256: ac09d1225640c03ce15163a303f19f081ebf797cdcdcf43c395d88e2262cd15d
font_02_sfnt_off00018fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FBA 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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