Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3e029c94c8f7e…

MALICIOUS

PDF

92.4 KB Created: 2021-04-22 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ea46dc6ae7d327c3d23a0e84ce5279e7 SHA-1: b1c8fbc00296eba37e6b3b7fbdbfd481d15c0850 SHA-256: 23f3e029c94c8f7ed32d5aaded53d6f6258c3697bd9c2471525a1a0b8b0a48d3
186 Risk Score

Malware Insights

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

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 0.9996

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 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.
  • 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://gimoguvi.ru/strik?utm_term=libro+espa%25C3%25B1ol+lecturas+segundo+grado+sep PDF link annotation
    • https://cdn.sqhk.co/wokiwife/gFjguBf/e_coli_symptoms_how_fast.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/senopesaki_boditiluweg.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/gfieAwt/34561047115.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/kjagfha/all_recharge_bill_payments_cashback_apps.pdfIn PDF document text
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/c8feaa7c4c82.pdfIn PDF document text
    • http://fasufigige.iblogger.org/7973663898.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/JgWgdjg/46940831348.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/urgjsmE/guide_for_locate_via_sms_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavazer/bghSkDe/raystorm_pro_cpu_waterblock.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/hijhyha/13312660920.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/qK9sWgi/gukupi.pdfIn PDF document text
    • https://renobulog.weebly.com/uploads/1/3/4/4/134464004/14d5e2d1a1f43.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuduwedimu/WOhgCha/86054541549.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/fedef.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/iLgfVgi/prepaid_mobile_recharge_offers_jio.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/Pjc0Djb/jotanenaka.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/ihhhhau/picture_collage_blanket_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ichiyrR/cheesecake_recipe_with_cream_cheese_and_condensed_milk.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/cgdE7jh/51573558443.pdfIn PDF document text
    • https://pimakiwukusa.weebly.com/uploads/1/3/4/7/134712386/9a553303365591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxaxinum.epizy.com/66275025788.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 5536 bytes
SHA-256: 2a483534ce5215e6ffdea33226a70d749203635cc8c39904a55b926a5aa564a6
font_01_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 11776 bytes
SHA-256: 3aaffddd5d29e520a4e16ac6b58c4af74bde4aed3cab7be7a2f79a130f88d6be

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