Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac7c1a44a417374…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 03:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1eec6852bc72dce897cc98585013c332 SHA-1: 5a2b18bfe22508e147900b0c5be8860147a74f95 SHA-256: fac7c1a44a41737491422cc60b3f61377b5d84fa61454467c3dc89bbc3ffeff5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=unit+11+vocab+level+e+synonyms+answers PDF link annotation
    • http://vulufinagi.mypressonline.com/58075008308.pdfIn PDF document text
    • http://ronenepe.22web.org/37577631596.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fe4d9df21f5b.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/P3ijjau/20166179224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_6056fa543d8ed.pdfIn PDF document text
    • https://cdn.sqhk.co/kevemelis/dgiChcM/24764796298.pdfIn PDF document text
    • http://vovidumuf.22web.org/total_conquest_unlimited_all.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fe77409edbcb.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/85th_constitutional_amendment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/baba4924-4e29-4358-a8e6-114159cabfa6/wisajumekubeniwe.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_ea0662390637450ab78485ec868ed926.pdf?index=trueIn PDF document text
    • http://wajiletum.epizy.com/bidedulukaxaxidivepojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8163b741-8090-4a38-bede-940c77b30b70/mercury_black_max_150_xr2_service_manual.pdfIn PDF document text
    • http://wajiletum.epizy.com/nature_s_answer_ut_answer_reviews.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_d76731ced8734bea901ee20e55189c60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c586bd02-dabe-4a45-baa6-520c46b332fb/go_math_5th_grade_workbook_online.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/pibobox.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_7500456e28eb497baf999509c1839544.pdf?index=trueIn 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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5380 bytes
SHA-256: 470f0d12fdece37421bebad810dcb376085197732c91bc4bf784069c08284a89
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10724 bytes
SHA-256: 07af5a40337b4d64255dc303fd75396299c44b1b32aa510a7304aadd40820d82

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