Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bb3210e498dda9…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 08:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0c77c2b185c8125595fe09f67137e6db SHA-1: 223da3c569d18d98238cef6325d998f2a206ccd6 SHA-256: d1bb3210e498dda90423958cba105a6124ce7ce06e2a0beb35fbaf9960eb9bb5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern observed is the creation of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=basic+theorems+of+boolean+algebra+pdf PDF link annotation
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/e846ea7c199.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/bisabe.pdfIn PDF document text
    • http://firstsecu-paypal.com/sazevutaq261e.pdfIn PDF document text
    • http://vinezusazal.iblogger.org/gist_cdac_full_form.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/zefuwal-taxas-moxekuxo.pdfIn PDF document text
    • http://gooddevice-online.com/mental_health_recovery_worksheetsy9mh7.pdfIn PDF document text
    • https://setunifajufin.weebly.com/uploads/1/3/5/9/135989633/fojufelana_vukedofu_gewin_vezawanepibizet.pdfIn PDF document text
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/lasupam.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/logukunikezaruf.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/b6e2dde453314a3.pdfIn PDF document text
    • http://reduslimitaly.website/31078438955srqg4.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/nixebiwajakag.pdfIn PDF document text
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/loduvij-wifumebevu.pdfIn PDF document text
    • http://circus.market/67274226942lq3iu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rileponabamel.rf.gd/ka_ka_balachander_songs.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/rival_20_quart_programmable_roaster_oven_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/angry_birds_go_1._0_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/foviwazumivamizigav.pdfIn PDF document text
    • http://fazobelo.onlinewebshop.net/taxudunimunufan.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/16556387441.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/mechanical_engineering_salary_in_dallas_texas.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/9857433212.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/tosal.pdfIn PDF document text
    • http://badugumafuzalij.rf.gd/ralph_ellison_invisible_man_analysis.pdfIn PDF document text
    • http://movebuze.epizy.com/81551469194.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_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 5760 bytes
SHA-256: 88ee06f9e130d37f00b7f531720b453b52a3c6667df2d4bf3f163edf1761e8b5
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 10556 bytes
SHA-256: 4c6043a7907d4768a8c52eac5912a36d9ae6455897c8063e2fc53b56265ba354

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