Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28db1f7271bfb0a…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 22:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3be32dd68686484871caeb9fac48e80d SHA-1: ca3bab6276e526b477bf7688dd652493acb0f9d7 SHA-256: d28db1f7271bfb0a546392df34548535dbe7874df1796541efb25580da367dc0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. One of the primary URLs, https://botokaw.ru/strik, is associated with a lure for 'adobe photoshop cc 2014 tutorials for beginners pdf', indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and numerous external links point to a malicious intent.

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 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://botokaw.ru/strik?utm_term=adobe+photoshop+cc+2014+tutorials+for+beginners+pdf PDF link annotation
    • http://lulizukudomiz.scienceontheweb.net/lefojudukekagisovuxave.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/rjcOjj4/turkish_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/YhfUhj9/monster_run_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/iihiRhd/swepco_bill_payment_address.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/ihlgiic/infection_rate_by_state_per_100_000.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/system_analysis_and_design_course_outline.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cd6478-ef05-44cd-bdd3-bc5217660cbd/what_effect_will_the_declaration_and_distribution_of_a_stock_dividend.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_21de053234724a0fa3c6fcb36abc1994.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_87aebd135d814fdeb3646a1904ae278c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf3206d-be9e-49be-966c-872fb236dece/26290046079.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_a1c2ed8cfbc445f2aa13fd4899484c5f.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_5efc8074a7b84baba10011f28968352a.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/22548200782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8675a6f-9aaa-4db4-9a12-4c5baa3848b7/behind_closed_doors_a_true_story_of_abuse_neglect_and_survival_against_the_odds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9441f3-3f21-4c57-9428-347cdabb1cce/87459201965.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_b1f3f36124e74c75a05e698bae746095.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_0c4ca8bf3c224b51aa5388aade44638a.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_a3256e3fba5a42b69c8a3a1135404af6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57983323-ace5-4612-9d39-0d9304f0db69/lomod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb0a9a0-d839-48e3-bea8-31381179f277/risupakofubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb3e7f9-2444-426d-88ec-d3039933d0a3/poxepokeravuwi.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_ec665e5bb12144c7a0cfed67af9ac94b.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5960 bytes
SHA-256: 261154dccb2130c14fe439baaf3fe2e8e6bbbee21f644877a6e75d45fb93533a
font_01_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 10724 bytes
SHA-256: 3193d1354b18c734183fa08db062bcb4b266509215bb32525531653c9e42928d

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