Malicious PDF — malware analysis report

Static analysis result for SHA-256 2437fb4ca4c30e09…

MALICIOUS

PDF

80.5 KB Created: 2021-02-24 23:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 78e4a42fc686d8ab23af56f31d509309 SHA-1: 709045ebfc2897fe1500bba73a05f61ee3f0a377 SHA-256: 2437fb4ca4c30e09ce683b015e048c8556f1dafa478506c22f2e75fb0d3a238f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though truncated, appears to be a lure related to a book summary, likely to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=el+amor+en+tiempos+de+colera+resumen+corto PDF link annotation
    • https://cdn.sqhk.co/zobarimumuje/dgcCdid/43995038700.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/OJ3Cnhf/15910068497.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/53695516863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fd11d0625b1a.pdfIn PDF document text
    • http://lunowizu.iblogger.org/5470984049.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/gYHcNwP/at_t_thanks_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/f5fhaia/busitazuwitoxupumikevuje.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/berumonavo_jomurideberimuz_lalifafagixoxa_warujaputepex.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/9854389.pdfIn PDF document text
    • https://bewosugug.weebly.com/uploads/1/3/0/8/130814774/sikawi.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/Gc7ihFg/rotax.pdfIn PDF document text
    • http://bixuvetojotenes.22web.org/oxford_discover_3_teacher_s_book.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/lozetunajolotatajulibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ffc737da4d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60125675d9e13.pdfIn PDF document text
    • https://kejopojoki.weebly.com/uploads/1/3/4/0/134018111/8831293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuwotegof.rf.gd/how_to_simplify_exponential_expressions_with_fractions.pdfIn PDF document text
    • http://zotubune.myartsonline.com/accuair_e-level_touchpad_controller_manual.pdfIn PDF document text
    • http://sikapatosibo.rf.gd/3173293829.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_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 5176 bytes
SHA-256: 7fff67414f6023bce4b2b709366b8f5b7289c0c7955394c16b3336bb5ca8e786
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 11360 bytes
SHA-256: 5e53ca2a310cf5f94fb1eb301cc1e5234e12ceb8545dd58070a817ac5f6de6c4

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