Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c93d22f0aacc81…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 07:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0266f15067bb6fd737dbb783148fe407 SHA-1: e2344cfe529e63b09e1a0fac834659d0a6652a88 SHA-256: b8c93d22f0aacc81c6fe8660ec6b10d254205f187e4cdd8fa66ea2ab39d13b8b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The presence of a Vizio recall lure in the document body, combined with the numerous external URLs, indicates an attempt to direct users to potentially malicious sites. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=vizio+e701i-a3+recall PDF link annotation
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/7008197.pdfIn PDF document text
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/9664333.pdfIn PDF document text
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/bavutazamidu-jakedopasi-mabebu-mexelebigepa.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/80aa028b5.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/337c2.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/4433956.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/pafapexabegelaxiwexe.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/5888512.pdfIn PDF document text
    • https://jurojapelo.weebly.com/uploads/1/3/4/8/134878956/kudikeloruvofojiz.pdfIn PDF document text
    • https://gekizunelim.weebly.com/uploads/1/3/4/8/134883517/xesixovele.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/d10e9b5b799c.pdfIn PDF document text
    • https://guxosenenizezov.weebly.com/uploads/1/3/4/5/134598055/rewelolo-poboko-nulekekuguziwo-mejizemodaf.pdfIn PDF document text
    • https://topudamix.weebly.com/uploads/1/3/4/5/134581811/famiful.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/462317.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/cbe4f361d69.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/kebuwebifigox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_c99b2a543143473a99504ea3f5570b60.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_e49178732abf4228bc72a7682a23b8f8.pdf?index=trueIn PDF document text
    • http://bovuzigaratufob.rf.gd/26608047024.pdfIn PDF document text
    • http://nukamepewavux.epizy.com/atlas_of_regional_anesthesia.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_82680b25c3a447f28fcd53ea6cf532c5.pdf?index=trueIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_92e2117d835345ceb79beff41f2eb513.pdf?index=trueIn PDF document text
    • http://gonesolipekivin.rf.gd/introduction_to_financial_planning_cfp_study_material.pdfIn PDF document text
    • http://gadabejevetel.epizy.com/24570330454.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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 5100 bytes
SHA-256: 181c8ee39bc14aede488a1c0f69eac5f6dc03d2154bd0429dce0eeb56e080670
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 11480 bytes
SHA-256: ec32b4b60deff0e7938947f9efaa422935f962585353ee391ded18e0d1eaac6c