Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81cc808244b0154…

MALICIOUS

PDF

77.0 KB Created: 2021-06-06 02:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bbbab847965d9cf647b9ac11c0d494d SHA-1: 7ad2384014395ed1a432d4ddac749c6332649276 SHA-256: b81cc808244b0154bc04fbebd9c2ce26afc91d98cc524cff26b7ac5b313d127b
194 Risk Score

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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of URLs like 'https://krisoc.ru/pbw?utm_term=davis%2527s+drug+guide+for+nurses+17th+edition+pdf' indicates a lure to download or view content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/pbw?utm_term=davis%2527s+drug+guide+for+nurses+17th+edition+pdf PDF link annotation
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/zofuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5fe0340e82e6c.pdfIn PDF document text
    • https://kizufujuzuvajet.weebly.com/uploads/1/3/5/3/135316206/3c065d2b.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/jazun-rokusinerivet-zerolumodijos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_60324847ec479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_5fefd648f3543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408996/normal_60360dd454cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6056458a8872d.pdfIn PDF document text
    • https://masoluvilat.weebly.com/uploads/1/3/4/5/134576839/givepijesesal.pdfIn PDF document text
    • https://bojomuse.weebly.com/uploads/1/3/4/4/134462584/fomibibofuj-rigifopuxis-xoxexidemojome.pdfIn PDF document text
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/9749600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_6047d0c983ddf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ff69387d2c79.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/4afb60.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
    • https://uploads.strikinglycdn.com/files/44c5b34c-59ee-4748-9172-13e3ce1e10f8/harry_potter_und_der_stein_der_weisen_hrbuch_download_free.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144479025/past_simple_and_past_continuous_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3c9d66-62e8-480a-b0d1-04c6ffb1748d/15558445396.pdfIn PDF document text
    • http://togusan.pbworks.com/f/wazujeboreboligixosafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8aa4ea-de27-464e-957b-80f451a15697/comment_rendre_un_non_modifiable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a035a9-a899-4c65-968a-1423a9a70cac/dibujo_tecnico_con_graficas_de_ingenieria_14.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_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 5376 bytes
SHA-256: 10d8c73edd1a0affc3b6286c7f93eae0045611fff6192c086b171adde9cbcc50
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 11216 bytes
SHA-256: 8914ecf39182743b7e7c3d5b3bdc673b40f419698f5c5e96ba8516e25e808011
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.