Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc53dddd51103359…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 17:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d31892753047d52ec1c5b13586ad4bc4 SHA-1: d208a75f5ec068ae9143395b79db6fc18c0da810 SHA-256: bc53dddd51103359b0d001cb81291937bd8ed919fd97e1584e0338de915dad3c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=amandemen+ketiga+pdf In PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/00796cb0a7bf.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/ef5cd192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409614/normal_5fe14e6ddbf01.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/ujhibjd/nofozurewigogamubefajobeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ff21f463cbb0.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/zRWhfja/debulavewidibusagosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_604469f5306a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_601105624b92e.pdfIn PDF document text
    • http://kiwalapisetovu.iblogger.org/bujojafaxopaganugik.pdfIn PDF document text
    • http://welaxixijexawi.iblogger.org/twenty_thousand_leagues_under_the_sea_sparknotes.pdfIn PDF document text
    • https://cdn.sqhk.co/kirorakoxu/OhfgiEK/xutamawuveji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_31fdaa4fe51d40a3aca4cbb1d9bf92d3.pdf?index=trueIn PDF document text
    • http://wikatamuk.rf.gd/metabolic_syndrome_uk.pdfIn PDF document text
    • http://boloxevukizuf.rf.gd/3d_mmo_villagers_and_heroes.pdfIn PDF document text
    • http://mulagokonud.rf.gd/97159015148.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_5ba1f706f1c94041a0eae243720bbf47.pdf?index=trueIn PDF document text
    • http://kefixofelapadi.epizy.com/repodotuj.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_4d11df35f0474cd4b026c5b6ed9bf5a1.pdf?index=trueIn PDF document text
    • http://jexawatenafule.rf.gd/engineering_mechanics_dynamics_13th_edition_solutions_manual_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 5108 bytes
SHA-256: 57388115cf363507b70aa103116557ccfb87724c416d2559e0e5037e5e7c7ec9
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10952 bytes
SHA-256: eebfc3b978e7397fac2016ad656f9b51476be471a3a835694e05f2e5a12192aa

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