Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b142959754de5f…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 02:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0e94922a63b0fd7c19c6190abb56516f SHA-1: 19bed384fc1875e0552440abd4e2268bf6249948 SHA-256: f8b142959754de5fc63164709581750d4f8565d3fcc58cebd83a9682c020cf54
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, likely for SEO manipulation or to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, possibly exploiting PDF vulnerabilities or serving as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=what+are+sentry+safes+made+of PDF link annotation
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/zukewexomo.pdfIn PDF document text
    • https://wewopamutufufo.weebly.com/uploads/1/3/1/3/131398135/4c2433713a.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/fd3f47.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/ropawekipojowa_puwotozofumoteb_jiboxexilof_nojofirodoloku.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/fevawojokig-rolewokisenim.pdfIn PDF document text
    • http://lnstagramoriginal.com/foamex_sheet_cut_to_sized2dq0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_6033d1faeeff4.pdfIn PDF document text
    • https://vefajuvajodal.weebly.com/uploads/1/3/6/0/136094574/visogijilevi.pdfIn PDF document text
    • http://fruit-ita.fun/nejuzanurapiguzun9yy0n.pdfIn PDF document text
    • http://pressit.space/mother_earth_news_digital_subscriptiony0vxk.pdfIn PDF document text
    • http://instahelpforbusiness.com/wetujibatilewimomuramakioskb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_601837328b795.pdfIn PDF document text
    • http://vertigoa.online/are_all_bacillus_spore_forming56djn.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/zuvexesajul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_601e02eec6d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60194dd3c161b.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/622031279483vdvt.pdfIn PDF document text
    • http://50off.pro/43001115191koiki.pdfIn PDF document text
    • http://wibaposazidomaz.iblogger.org/29360098828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napipipazapuka.epizy.com/48601252531.pdfIn PDF document text
    • http://torumaxot.rf.gd/39762080224.pdfIn PDF document text
    • http://gawebunopom.rf.gd/batman_the_dark_knight_android_gameplay.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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 5232 bytes
SHA-256: c90d4ef5227ed67633b3d97931da49ba552a925b709e302565a06be20718e081
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 10672 bytes
SHA-256: 9174219b25ffe506d1d532c20547258f6665844a786bbda0649d5bf533667868

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