Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cbe855a777bfaa…

MALICIOUS

PDF

70.1 KB Created: 2021-03-14 03:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: beff05971934474c836a43f8c8de8628 SHA-1: 17a533f76497223f16dad50b13e3e1579bb2b52b SHA-256: d8cbe855a777bfaae02ad5a7f5d74fa6ca8f141784e33d95a15769b3eb25fd88
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 0.9997

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://bologen.ru/strik?utm_term=how+to+install+basic+honeywell+thermostat PDF link annotation
    • http://cmbmarketing.agency/gikoponidelulifwz3d.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/complete_z_score_table.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/dobenibepu.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/evidence_based_anger_management_curriculum_for_adults.pdfIn PDF document text
    • http://hookup153.online/halloween_worksheets_for_1st_gradelumt6.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/susawajilazimaditeto.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/99998079857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_e46f6d924e0a44aeb026b314a72c9a52.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_8baf79fe058241f9a7df57c461c1e505.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a398b02c-50fe-4a6e-acdc-91af82c58d28/osho_courage_book.pdfIn PDF document text
    • http://fekabama.epizy.com/how_to_avoid_coastal_erosion.pdfIn PDF document text
    • http://tononuzaribiw.rf.gd/zeruzunimubofejofotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae875a11-1261-4d50-a2af-fe5d37e9839f/35681602537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766b1b02-e5bb-4f7c-ba0a-1e7ba4c87e72/college_algebra_textbook_free.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_950623afde93461e8df7148c97cfdfbd.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_c274a920e4974fa5b2b7056304cc50c5.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_73684d4048d84285891ea21a72dd4349.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c3e888-ef9f-4a83-9f87-d78080575051/ashrae_handbook_2001_fundamentals_ch._26.pdfIn PDF document text
    • http://duzebufulumaw.epizy.com/vosopugarevulefonexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba02f08-adf6-4a2a-978e-a0d0fd00fb01/paginas_para_aprender_ingles_gratis_online_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6bd327-0b00-4f3d-8218-b0e80520b35a/grade_4_math_fractions_worksheets.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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 5336 bytes
SHA-256: 36dfa15b7efbaa720bc03ff7b8ca90bd1579eb418b42bba1a87827e0fc9fae56
font_01_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 10596 bytes
SHA-256: a9538e3393e57255253e1058e88362300a1d222503ed6241c3ec686e3b0ff87f

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