Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484e38c24ebfce9…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 05:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b6e3d7c19afacf8f0913582c8f1fcaa1 SHA-1: a2e1e88f4d8edc1db3892ee1ffd866768554dd33 SHA-256: b484e38c24ebfce961722f98770f1f6e05185f2ddc9869fb746acfc6c32e496d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://xezojetit.ru/aws?utm_term=taco+bell+5+dollar+box+january+2021 PDF link annotation
    • http://bathforlegs.xyz/98317892807fbzpl.pdfIn PDF document text
    • https://sawuvuvexefiz.weebly.com/uploads/1/3/5/9/135964560/fowafesuj.pdfIn PDF document text
    • https://gutototuwasikik.weebly.com/uploads/1/3/4/8/134876789/9d174.pdfIn PDF document text
    • http://intekzafast.online/david_sedaris_billie_holidaypepb6.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/napozuv.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/fdfe649b8c96bbf.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/2a3ff27214118e.pdfIn PDF document text
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/sefuduxomibitotis.pdfIn PDF document text
    • http://itclick.info/diy_wood_bat_house_plans8aqaw.pdfIn PDF document text
    • http://winoraama.space/textos_argumentativos_ejemplos_resueu7tjd.pdfIn PDF document text
    • http://bit7.top/chronological_case_summary_form_indianam518a.pdfIn PDF document text
    • http://ziduruwekomowob.iblogger.org/86821156480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waduzirader/42962965054.pdfIn PDF document text
    • http://welegem.epizy.com/42896747901.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/topewofasoduti.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_3c034cc8d3624140b15f303e922e8c2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/60320968426.pdfIn PDF document text
    • http://kinuvafarugabob.rf.gd/59049997360.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/mujixevuzepovefigejijovu.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/5446088136.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_77da73ec3cc8455db7a6a7dea2b0265e.pdf?index=trueIn PDF document text
    • http://tulafixobokov.rf.gd/anorexia_nervosa_definition.pdfIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_db536adaddbb44149716b69e4293627b.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_4f0da1bfa3b343b3910931f0ebb2920c.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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 5540 bytes
SHA-256: ca70ab6c51af2b8b2b1a92af29d92f8ee0a31993e510cc0e0f7aab9613c7b42e
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 11504 bytes
SHA-256: 54e66d412d64528fcfbbcc083c9da601af9c3423c174c744ee7750af9365bb53

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