Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c733571519e2e6…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 08:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 14fbc7b2a932a60e3dfd231499b0082b SHA-1: b174ea46b675c549ce0daf0a66c5e3fdf0f7f1fc SHA-256: 21c733571519e2e6c059c25f2edb3dd5fcf06f6ee284d28658175f8f126cbcc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs, particularly 'https://baarspo.ru/award?keyword=celestamine+bula+pdf', suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs point towards a malicious intent to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://baarspo.ru/award?keyword=celestamine+bula+pdf PDF link annotation
    • https://cdn.sqhk.co/numisezopo/hGq3ihY/geometric_tattoo_designs.pdfIn PDF document text
    • https://nulazonale.weebly.com/uploads/1/3/4/8/134892754/2261427.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/iU5zyPC/petroleum_engineering_entry_level_jobs_in_canada.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/nizorunimuros_tezozipo_faripifunivofeg.pdfIn PDF document text
    • http://5gusevshop.space/8766596642741r1w.pdfIn PDF document text
    • http://lefakumal.iblogger.org/vodka_bottle_mockup_free.pdfIn PDF document text
    • http://flash-sar.online/587913204104gcgz.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/bathroom_accessories_data_sheet.pdfIn PDF document text
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/6aa92514.pdfIn PDF document text
    • http://hyipinvest.site/samsung_galaxy_note_4_battery_price_in_bdyamlh.pdfIn PDF document text
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/8372729.pdfIn PDF document text
    • http://raisinshub.club/sabinazda6q.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/5623672.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/5iijcjf/jebemuzu.pdfIn PDF document text
    • http://nebo-baikala.ru/combining_like_terms_worksheet_6th_gradeyb4lm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/biwabotaxotebija.pdfIn PDF document text
    • http://suxopubovokok.epizy.com/fidanepuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39eed9a-2a6d-4e6b-acbf-14d4292eb4c9/dirt_devil_power_stick_filter_walmart.pdfIn PDF document text
    • http://bajejefi.epizy.com/derry_nh_police_incident_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec3c36b-ba60-4e67-960f-f1ebd11145f5/safe_haven_animal_rescue_ny_yaphank.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/what_is_the_meaning_of_audacity_in_oxford_dictionary.pdfIn PDF document text
    • http://latujetob.epizy.com/alcatel_pop_4_plus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0c0179-3406-46f3-8a97-e237c3eb6e2a/97165247615.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_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 5136 bytes
SHA-256: 49381f871eb4bcf705138c0265a653ed9f848cdf5197abe8d35e3ddbfe7ff21a
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 13596 bytes
SHA-256: 050018a01f92201d3e272c3bc24f3710d27dcac1222c6600a15ac575cf3aa5c8

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