Malicious PDF — malware analysis report

Static analysis result for SHA-256 de81112f68838ffc…

MALICIOUS

PDF

84.9 KB Created: 2021-06-10 12:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4d6026f6c32057fe1a12709a7bf35aff SHA-1: 051dfb496619fc8b4558e647c69af970414c8d2b SHA-256: de81112f68838ffc1386ee51c7a953edb1cfa5cd46fc0f181234eeefd28c1f24
186 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on disposable domains, with one primary URL leading to a purported 'lucky block mod download'. Heuristics indicate a high likelihood of phishing and malicious intent, further supported by ClamAV detection. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://inwebjor.ru/pbw?utm_term=lucky+block+mod+download+1.12+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fdbe15d6fc4f.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/mexofukesaj-busizupefugilew-jonasoguxep.pdfIn PDF document text
    • https://wovikuzejujitij.weebly.com/uploads/1/3/4/5/134506660/01b334cab443.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/loporuge-pijulav-voperilib.pdfIn PDF document text
    • https://lakaporizad.weebly.com/uploads/1/3/4/2/134234628/loxos.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/botes.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/jedaz.pdfIn PDF document text
    • https://xogedanubukojoj.weebly.com/uploads/1/3/4/4/134491538/6ffbd71412.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/aa1d2b3d04.pdfIn PDF document text
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/zaxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fe96fa7e3949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_60566069ca809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_605b52a17e051.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4365540/normal_60b35c247afa0.pdfIn PDF document text
    • https://represent.com/store/popularmmosIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulamiz.pbworks.com/w/file/fetch/144889305/hindu_marriage_biodata_format_for_girl.pdfIn PDF document text
    • http://fisakujimet.pbworks.com/f/51783987134.pdfIn PDF document text
    • http://daridameku.pbworks.com/w/file/fetch/144638931/doldurulmu_aday_retmen_formlar_din_kltr.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416385/39976624719.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/how_to_become_a_medicaid_transportation_provider_in_florida.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144493731/96684038209.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_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 5368 bytes
SHA-256: c85452d4406eb56d09946d886ed1a0aa503e320f69dcc98e777703adfc893193
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 13308 bytes
SHA-256: 661ee94bdaa6b96807a0c030d7002a0656be15ed52b5bb70ceef520f0d00d276