Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eab98805588c8a9…

MALICIOUS

PDF

72.0 KB Created: 2021-04-03 18:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0c47da2a1af4412229aac17ff1fb4e87 SHA-1: cad3cd26a8ebf350178b2e408dac72343f1356eb SHA-256: 3eab98805588c8a9bf736fe5b500183bf3a73190dfb659883a6ba45b89f547cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://nipisod.ru/123?utm_term=adrenal+insufficiency+guidelines+2018 PDF link annotation
    • http://dubesitobu.22web.org/ed_rosenthal_seeds.pdfIn PDF document text
    • https://fapojenulexo.weebly.com/uploads/1/3/1/3/131383319/f569087.pdfIn PDF document text
    • http://lazerepil.site/200612614644eg7h.pdfIn PDF document text
    • https://fubaxegadajud.weebly.com/uploads/1/3/4/4/134454669/mesugovulokofupodu.pdfIn PDF document text
    • http://sozolusi.iblogger.org/congruent_triangles_snowflake_activity_worksheet_answer_key.pdfIn PDF document text
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/vuvujopebi_vunililisit_faruxusevefuza_jepusamimuvo.pdfIn PDF document text
    • http://clipshd.design/sabaxojomapn016.pdfIn PDF document text
    • http://goproonly.com/predicate_nominative_and_predicate_adjective_worksheet_with_answersrwbg2.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/jujoxudef_zeberemotufofo.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/5301180.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/8331714.pdfIn PDF document text
    • http://dkmz1.club/breakfast_on_pluto_bookduokh.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/ad710e.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/atonal_harmony.pdfIn PDF document text
    • http://ottics.ru/motorola_sb5101u_xfinity2h4g1.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/bonoto.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/degeloxuwelat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nuridoxiwe.rf.gd/bitcoin_solo_mining_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/86147720343.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/tenant_reference_template_from_landlord.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/lagu_xaluna_ambyar_cover.pdfIn PDF document text
    • http://tefotifomasun.epizy.com/39485797489.pdfIn PDF document text
    • http://vumopigaw.epizy.com/65006653594.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 5492 bytes
SHA-256: 585bca50d1b06b2e1ef50d3186fc75cf243b9e80326b0b613fef23f237df5ef3
font_01_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 9816 bytes
SHA-256: ee6068bab7bcf34af832ec5217e204267207dde6f60ed7a1186a7e61a669f10e
font_02_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2